Seven Agelocer watches in this guide come on a stainless steel bracelet: the Astronomer Moonphase, Astronomer Silver Galaxy, Astronomer Gold Galaxy, Volcano Flame Orange Luminous and Free-Sprung Tourbillon Diamond on steel, plus the Budapest Big Date and Astronomer 29.5-Day Moonphase, which offer steel as a variant. The six with published steel weights run 132-146g, roughly double the two leather weights published for watches in this guide (66.8g and 76.2g). Most fit a 150-210mm wrist, and the Volcano fits 165-220mm. Below are each model's catalog weight, wearing length, buckle and price, starting at $329 on steel.
Quick picks:
- Moonphase on steel, no sold-out finishes: Agelocer Astronomer Moonphase Steel — all four finishes in stock (rose gold-tone or silver-tone, with or without zircon), $399-$499, 146g, butterfly clasp.
- Slimmest automatic here: Agelocer Budapest Big Date — $329 on steel (also $299 on leather), just 10mm thick.
- Boldest sport pick: Agelocer Volcano Flame Orange Luminous Steel — $369, 44.3mm, luminous dial.
- Dressiest complication on steel: Agelocer Free-Sprung Tourbillon Diamond Blue Steel — $1,029, 132g, flying tourbillon with diamond-set accents.
Skip the bracelet if 132-146g feels heavy on your wrist by the end of a workday — the leather Free-Sprung Tourbillon (66.8g) and leather Astronomer 29.5-Day Moonphase (76.2g) weigh roughly half that. The next section has the exact numbers.
Which Agelocer watches come on a steel bracelet?
Seven Agelocer models in this guide come on a steel bracelet: the Astronomer Moonphase, Astronomer Silver Galaxy and Astronomer Gold Galaxy moonphases, the Budapest Big Date, the Volcano Flame Orange Luminous, the Free-Sprung Tourbillon Diamond, and the Astronomer 29.5-Day Moonphase in its steel-bracelet variants. On steel, prices run from $329 to $1,029, and Agelocer also sells an $85 steel replacement bracelet for the 29.5-Day.
The Agelocer Astronomer Moonphase Steel ($399-$499), Agelocer Astronomer Silver Galaxy Moonphase Steel ($399-$499) and Agelocer Astronomer Gold Galaxy Moonphase Steel ($399) all run the same Cal.A4610 automatic movement — see Agelocer's movements by model if you want the calibre breakdown for the rest of the range. The Agelocer Budapest Big Date sells leather and steel as variants on the same product page. The Agelocer Volcano Flame Orange Luminous Steel is the biggest case here, and the Agelocer Free-Sprung Tourbillon Diamond Blue Steel is the only tourbillon. The Agelocer Astronomer 29.5-Day Moonphase sells steel-bracelet variants on the same page as its leather versions, at $529 against $499 on leather, and Agelocer's own Original 20mm Replacement Strap ($85) comes in a steel option too.
How much heavier is steel than leather on the same watch?
Steel roughly doubles the weight. The Free-Sprung Tourbillon Diamond goes from 66.8g on leather to 132g on steel, and the 146g Astronomer Moonphase Steel compares with 76.2g for the leather Astronomer 29.5-Day Moonphase, a close sibling with a 10.6mm case. The Budapest and Volcano weigh 135g and 136g on steel; Agelocer doesn't publish a leather weight for the Budapest, and the Volcano listed here comes on steel only.
Most of that difference is the bracelet — a 316L stainless steel chain in place of a leather strap (cowhide on the 29.5-Day, crocodile-pattern leather on the Free-Sprung Tourbillon), and in the two comparisons above that adds roughly 65-70g. It also means more to notice after eight hours at a desk. The leather Agelocer Astronomer 29.5-Day Moonphase and the leather Agelocer Free-Sprung Tourbillon Diamond are the two direct comparisons; for the general case against titanium as well as leather, see our honest titanium vs stainless steel comparison.
Agelocer Astronomer Moonphase Steel — 146g, 40mm case, 11mm thick.
Moonphase picks on steel: Astronomer, Silver Galaxy, Gold Galaxy
All three Astronomer moonphases share the same frame: a 40mm, 11mm-thick 316L steel case, a 20mm steel chain bracelet, a butterfly buckle, an 80-hour Cal.A4610 reserve at 28,800 vph, and 50m (5 ATM) water resistance. An 80-hour reserve means the watch can come off Friday evening and still be running when you pick it up Monday morning — see our longer look at what 80 hours of reserve actually buys you.
The Astronomer Moonphase Steel is in stock in rose gold-tone or silver-tone steel, with or without zircon stone accents, $399 to $499. The Astronomer Silver Galaxy Moonphase Steel is currently in stock in rose gold steel at $399, or with zircon accents in silver or rose gold steel at $499. The Astronomer Gold Galaxy Moonphase Steel is in stock in a silver-tone steel finish at $399. For how these compare to the brand's leather Astronomers, see our full Astronomer review.
Agelocer Astronomer Silver Galaxy Moonphase Steel — the butterfly clasp that closes all three Astronomer steel bracelets.
Big date and sport picks on steel: Budapest, Volcano, Free-Sprung Tourbillon
The Budapest Big Date is the slimmest automatic in this group at 10mm thick (only the hand-wound Free-Sprung Tourbillon, at 9.7mm, is thinner), with a 40mm case, the same Cal.A4610 movement and 80-hour reserve, and a large, legible date window. It's $299 on leather or $329 on the steel bracelet, in black, brown or blue, and, like the Astronomer 29.5-Day Moonphase, it sells leather and steel as variants on the same product page rather than as separate listings. Our full Budapest review covers the watch in more depth.
The Volcano Flame Orange Luminous Steel is the largest watch here — 44.3mm, 12.5mm thick, 136g, on a 24mm steel bracelet closed with a pin buckle instead of a butterfly clasp. It runs Cal.A5505 with the same 80-hour reserve and comes in four in-stock colorways (orange, green, blue, yellow) at $369 each.
The Free-Sprung Tourbillon Diamond Blue Steel is the only tourbillon here: a hand-wound Cal.9001 flying tourbillon with diamond-set accents, 40mm, 9.7mm thick, 132g, 80-hour reserve, $1,029. For what the complication itself is doing under the dial, see what a tourbillon is and what it actually costs; for tourbillons specifically on a bracelet, our steel-bracelet tourbillon roundup compares three Agelocer tourbillon picks on steel from $829.
Agelocer Budapest Big Date — the steel bracelet variant, 135g, 10mm thick.
Agelocer Volcano Flame Orange Luminous Steel — 44.3mm, 136g, pin buckle.
Agelocer Free-Sprung Tourbillon Diamond Blue Steel — 132g on the bracelet, versus 66.8g on the leather version.
What wearing length do Agelocer steel bracelets fit?
Agelocer lists a 150-210mm wearing length for the three Astronomer steel models (Moonphase, Silver Galaxy, Gold Galaxy), the Budapest and the Free-Sprung Tourbillon, and a wider 165-220mm range for the larger Volcano. Those five close with a butterfly clasp; the Volcano is listed with a pin buckle instead.
A butterfly clasp folds two hinged leaves inward and locks flat against the underside of the bracelet, so there's no buckle pin or loose strap end to catch on a cuff. Agelocer lists the Volcano's bracelet with a pin buckle but doesn't detail how it fastens, so check the clasp photos on the product page if clasp style matters to you. Agelocer's own listings don't document whether links can be added or removed, so treat the stated range as the fit window rather than something you can extend.
Can you add a steel bracelet to a leather Agelocer later?
Among the models in this guide, only the Astronomer 29.5-Day Moonphase has an official swap option listed: Agelocer's own $85 20mm replacement strap, which fits model numbers 6411, 6412 and 6415 and comes in leather or steel. Agelocer doesn't list a separate bracelet upgrade for the Budapest, Volcano or Free-Sprung Tourbillon in the catalog here.
That strap is worth knowing about if you already own, or are considering, the leather Astronomer 29.5-Day Moonphase and want the option to switch looks later rather than buying two watches. It's sold separately for $85 in grey, black or brown leather, or in silver or rose gold steel — browse the full range in Watch Accessories & Replacement Straps. For every other model in this guide, buying the steel version outright is the only route to steel; there's no documented swap-on bracelet for them.
Agelocer Original 20mm Replacement Strap — $85, fits Astronomer 29.5-Day Moonphase models 6411, 6412 and 6415.
Agelocer steel vs leather: which should you buy?
Buy steel if you want one case that works with a suit and a T-shirt and don't mind the extra 65-70g on your wrist; buy leather if you want the lightest version of the same watch. The Budapest Big Date lets you pick either on one product page; so does the Astronomer 29.5-Day Moonphase ($499 leather, $529 steel), while the Astronomer Moonphase and Galaxy models are listed on steel only.
Once you own the steel version, see our guide to cleaning and protecting a stainless steel watch for the specifics.
| Model | Movement | Case size | Weight / wearing length / buckle | Price | Who it suits |
|---|---|---|---|---|---|
| Astronomer Moonphase Steel | Cal.A4610 automatic, 80h | 40 x 11mm | 146g / 150-210mm / Butterfly | $399-$499 | Moonphase buyers who want a bracelet instead of leather |
| Astronomer Silver Galaxy Steel | Cal.A4610 automatic, 80h | 40 x 11mm | 146g / 150-210mm / Butterfly | $399-$499 | Buyers who want the galaxy dial in rose gold or with zircon accents |
| Astronomer Gold Galaxy Steel | Cal.A4610 automatic, 80h | 40 x 11mm | 146g / 150-210mm / Butterfly | $399 | Buyers who want the galaxy moonphase in silver-tone steel |
| Budapest Big Date | Cal.A4610 automatic, 80h | 40 x 10mm | 135g (steel) / 150-210mm / Butterfly | $299 leather / $329 steel | Buyers who want a slim, legible everyday date watch |
| Volcano Flame Orange Steel | Cal.A5505 automatic, 80h | 44.3 x 12.5mm | 136g / 165-220mm / Pin | $369 | Buyers who want a larger, high-visibility sports watch |
| Free-Sprung Tourbillon Diamond Blue Steel | Cal.9001 manual, 80h | 40 x 9.7mm | 132g / 150-210mm / Butterfly | $1,029 | Buyers who want an open-worked tourbillon with diamond accents on a bracelet |
| Astronomer 29.5-Day Moonphase (steel variant) | Cal.A4610 automatic, 80h | 40 x 10.6mm | Steel weight and buckle not published (76.2g with pin buckle on leather) / 150-210mm listed | $499 leather / $529 steel | Buyers who want the 29.5-Day moonphase with leather and steel options on one page |
Every model in that table is in stock, and all seven are rated to 50m (5ATM) water resistance. If you've already decided steel is the way to go, the moonphase trio and the Budapest start under $400; the Volcano is the one sport pick; the Free-Sprung Tourbillon Diamond is the step up to a hand-wound tourbillon. Browse the full range, including the leather versions this post compares against, in the Agelocer collection, or go straight to the Astronomer Moonphase Steel if the moonphase-on-a-bracelet combination is what brought you here. All of it ships with worldwide shipping and buyer protection.