BALL’s Roadmaster Marine GMT is listed in multiple references, including 40 mm and 42 mm versions. BALL’s specifications describe a titanium-cased automatic watch with a quick-set GMT hand; its 2025 manual explains how to operate that mechanism. This is a buyer-focused guide to the published specifications and instructions, not a firsthand wear or performance review: no fit, timing, lume or durability testing is established here.
What the Roadmaster Marine GMT is
BALL identifies the collection as the Roadmaster Marine GMT. Its cited listings describe a limited edition of 1,000, with titanium cases, sapphire crystals, ceramic bi-directional rotating bezels, and tapered titanium-and-stainless-steel bracelets. These are manufacturer-published details; check the exact reference, since dimensions and some specifications differ between listings.
The cited 40 mm reference is DG3000A-S8CJ-WH. BALL also lists 42 mm reference DG3222A-S2C-BK. A separate DG3030B-S2C-BK variant appears on BALL’s site. Compare the reference number, not just the collection name, when reviewing a listing.
How the 40 mm and 42 mm listings compare
| Specification | 40 mm DG3000A-S8CJ-WH | 42 mm DG3222A-S2C-BK |
|---|---|---|
| Case diameter | 40 mm (BALL listing) | 42 mm (BALL listing) |
| Lug to lug | Approximately 47.8 mm (BALL listing) | Approximately 49.7 mm (BALL listing) |
| Thickness | 14 mm (BALL listing) | Approximately 14.55 mm (BALL listing) |
| Lug width | 20 mm (BALL listing) | Not stated on the cited BALL listing |
| Gas-tube count | 28 (BALL listing) | 30 (BALL listing) |
The 40 mm listing has the shorter stated lug-to-lug measurement, but dimensions alone cannot establish how either watch will sit on a particular wrist. A try-on is the practical way to judge fit. BALL’s broader Marine GMT page gives a 29-tube count, so do not assume that figure applies to every reference. [40 mm listing] [42 mm listing] [Marine GMT page]
#1 Best Overall
- DG3030B-S3C-BR
- Chronometer
- GMT
- Day/Date
- Water Resistant
Movement, functions and BALL’s published ratings
BALL lists its automatic RR1203-C caliber and COSC chronometer certification for the cited models. The listed functions are hours, minutes, sweep seconds, day, date, and three-time-zone indication through a patented quick-set GMT mechanism.
- Water resistance: 300 m/1,000 ft, according to BALL.
- Anti-magnetism: 4,800 A/m, according to BALL.
- Shock resistance: 5,000 G, according to BALL.
These are manufacturer specifications, not results from independent testing for this article. COSC certification is likewise stated on BALL’s product pages; this guide does not report a separate timing test. [BALL product specifications]
Rank #2
- DG3038A-S1C-BE
- GMT
- Luminous Dial
- Chronometer
- Rotating Bezel
How to set the GMT hand
BALL’s 2025 owner manual identifies RR1203 among the calibers with the GMT quick-set mechanism. The pusher at 8 o’clock moves the GMT hand one hour earlier; the pusher at 10 o’clock moves it one hour later. The mechanism adjusts in one-hour steps rather than setting the hand continuously.
- Turn the pusher you intend to use about 60 degrees to engage it, following the manual.
- Keep the other pusher locked while adjusting.
- Press the 8 o’clock pusher to move the GMT hand back one hour, or the 10 o’clock pusher to move it forward one hour. Repeat as needed.
- Lock both pushers before using the crown.
Do not press both pushers together: BALL warns that doing so can damage the GMT function. The manual also advises against manually resetting the date between 8 p.m. and 2 a.m. Consult the [BALL Owner Manual 2025 v.38] for the complete operating guidance.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallRank #3
- DG3030B-S6CJ-WH
- Chronometer
- Luminous Dial
- GMT
- Rotating Bezel
Bracelet, straps and fit considerations
The cited listings describe a tapered titanium-and-stainless-steel bracelet. For the 40 mm DG3000A-S8CJ-WH, BALL states a 20 mm lug width, which makes 20 mm straps a possible accessory option. Confirm the attachment and end compatibility for the specific reference before buying a strap; the cited 42 mm page does not state its lug width.
Neither case diameter nor lug-to-lug length can substitute for trying the watch on. This guide has no firsthand wear observations, so it cannot establish comfort, balance, bracelet feel or how the watch wears over a full day.
Rank #4
- DD3072B-P1CJ-BK
- Chronometer
- Date
- Sapphire Crystal
- Rotating Bezel
Price and availability depend on the exact listing
When retrieved in 2026, the cited BALL pages showed US$3,499 for surfaced examples, with import duties included on those listings. Availability labels differed by page and reference, including 15 days, three months and out of stock. These are undated, changeable manufacturer-page listings—not a guarantee of stock, delivery timing or final transaction price. Check the exact reference and current terms with BALL before purchase. [40 mm listing] [42 mm listing] [DG3030B-S2C-BK listing]
Quick Recap
Best Value
- Make a splash with this handsome timepiece from Bulova's Marine Star collection
- Watch Size Chart:
- Open mouth design
- Round, rose gold-coloured stainless steel case
What to verify before choosing a reference
- Confirm the reference and its exact diameter, lug-to-lug length, thickness and lug width.
- Check the dial and bezel configuration shown for that reference rather than assuming all Marine GMT listings are identical.
- Review the bracelet fit and any strap attachment details before ordering accessories.
- Use BALL’s current listing for price, stock and delivery information, since those details can change.
- Consider whether you want to use the one-hour GMT quick-set mechanism and are comfortable following the pusher and crown instructions in the manual.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Free tools Windows power users keep installed
One-click scans. No signup required.
