Pocket watch: rare calendar watch with visible balance wheel and rare

Ca. Ø60mm, ca. 145g, silver, verge movement with spiral bridge, visible through a window on the back, very rare enamelled dial with gold decoration, off-centre time display, date and day of the week, Breguet hands, in working order and well preserved, very rare original key with magnifying glass for easier reading of the calendar scales. The exceptional size of 60mm is also rare!

Estimate:-

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