Roadmaster Challenger Moonphase (40mm), Black dial
The Roadmaster Challenger Moonphase (40mm), reference DM3130B-S13J-BK, is a 40 mm stainless steel diver from BALL's Roadmaster line, water-resistant to 300 m. This reference pairs a black dial with a stainless steel bracelet with folding buckle. It runs on the automatic BALL RR1801-SL. BALL lists it as a limited edition of 1,000. A moon-phase display turns once per lunation of about 29.5 days.
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Specifications
Collector photographs
Taken by people who own this reference: their light, their wear, their patina. Not the maker’s photography. Where the maker hasn’t given us a photograph, one of these is shown as the main image above, always credited. A few are the Atlas’s own, and say so.
If this watch is in your collection, yours would be the first. A photograph on the wrist shows what a studio image cannot: scale, wear, and how the piece has actually aged.
How to get one
The maker's page for this exact reference, the same page this catalogue's specifications are sourced from. It was a limited edition of 1,000, so the page may no longer offer it for sale.
BALL Watch Company publishes its current collection and its retailer or service network on its own site. Start there for what is actually in production; this catalogue records references whether or not they are still sold.
Check the reference number against the maker's own page before buying anywhere else. It is the one detail that is hard to fake and easy to verify, and it is what the specifications on this page are keyed to.

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