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Ball Roadmaster M Model A
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Launch year2024
MovementAutomatic, RRM7379, with mechanical alarm
Diameter41 mm
Water resistance100 m
Limited series333 pieces

Roadmaster M Model A

A mechanical alarm that rings like a real school bell, not a simple buzz

Model History

Announced in October 2024 as part of the Roadmaster collection, the Model A brings a rare and technically complex complication to the wrist: a genuine precision mechanical alarm, paired with a quick-set GMT second time zone hand and a 24-hour graduated ceramic bezel for reading a third time zone. The combination of functions — not just an alarm, but a fully functioning mechanical alarm plus GMT — is rare even in fine watchmaking, where mechanical alarms remain a niche complication.

At the heart of the model is the patented "AlarmMATIC" system, which abandons the traditional dome gong in favor of a metal ring gong protected by a specially developed outer polymer layer: this dual-material construction isolates the higher frequencies while also acting as a shock-resistant system. The precisely calibrated, single-piece hammer produces a sound described as similar to a school bell, clearer and more powerful than traditional mechanical alarms, lasting around 18 seconds.

The crown at 4 o'clock, dedicated entirely to the alarm, allows it to be set, wound and silenced in five-minute increments. The black dial, with its 29 "rainbow"-colored gas microtubes on the hands and indices, ensures full legibility even in the dark — consistent with the brand's technical identity — while the 41 mm case in 904L steel, produced in a limited run of 333 pieces, underscores the model's special-piece nature.

Technical Specifications

Movement
RRM7379, automatic, AlarmMATIC mechanical alarm + GMT
Case
41 mm, 15.2 mm thick, 904L steel
Accuracy
-4 to +6 seconds per day
Resistance
5,000 g shock resistance, 4,800 A/m magnetic resistance
Illumination
29 "rainbow"-colored gas microtubes
Bezel
24-hour ceramic, for a third time zone
Water resistance
100 m
Series
Limited to 333 pieces

Main Executions

Roadmaster M Model A (2024)First and so far only execution, 333 piecessince 2024
Fun Fact

The AlarmMATIC's alarm gong isn't dome-shaped, as in nearly all mechanical alarm watches, but ring-shaped, coated in a polymer that isolates its higher frequencies: a construction specifically designed to produce a sound closer to a real bell than the typical metallic buzz of mechanical wrist alarms.