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RGM Watch Co. Caliber 20, Ref. Caliber 20, steel case
Image courtesy of RGM Watch Co., official website · Official RGM model page headed 'Caliber 20 Models', linked from rgmwatches.com/watches as /caliber-20/. The file 20_65.jpg is one of the page's own gallery assets (all Caliber 20 assets on the page are prefixed 20_ or cal20). The shot matches the page's description of the model: seconds 'displayed on a disc, similar to many watches from the 1930s' and a 'large' mother-of-pearl moonphase, both visible on the guilloche dial inside the tonneau case.
RGM Watch Co.

Caliber 20

Ref. Caliber 20
2013–present · 38.5×42.5mm · caliber RGM Caliber 20: in-house manual-wind, 19 jewels, 18,000vph, tonneau-shaped; RGM’s first movement built with a motor-barrel winding system, a friction-reducing American railroad-watch mechanism not used in a wristwatch for over 50 years before this
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Movement tier: unclassified · caliber RGM Caliber 20: in-house manual-wind, 19 jewels, 18,000vph, tonneau-shaped; RGM’s first movement built with a motor-barrel winding system, a friction-reducing American railroad-watch mechanism not used in a wristwatch for over 50 years before this
Versatile size: fits most wrists (6–7.5 in / 15–19 cm)
38.5 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.

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