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I'm saddened to hear the news about Chuck's passing. He was a knowledgable and helpful watch enthusiast, with a real passion for all things Omega. My condolences to all his friends and family in this difficult time. Best regards, Stephen Sugiyama

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Your criteria seems to match Breguet, Watchmakers since 1775 by Emmanuel Breguet and available through Antiquorum . Cormac's review of this and other books on Breguet is here: The Great Breguet Book .

Railmaster, 36.2 mm 2504.52.00 (bracelet), 2804.52.37 (aligator strap) Automatic, co-axial movement, official chronometer, stainless steel case, transparent case back, water-resistant to 150 m.

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Image: Antiquorum

Hi John, Here's a movement photo of ref. 5197/cal. 591A scanned from Revolution , edition "USA 1": And a movement detail photo by Alberto of what is called the cal. 5770 (?) from this year's Basel report: Best regards, Stephen Sugiyama