Perpetual calendar. Research in ProgressOne large brass disc and one small on either side, pivoting on center nail. Top engraved: Calendarium Perpetuum” and days of the week in German, together with their symbols. Cut-out edge adjustable to date engraved on large disc. Perpetual calendar

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Size: 2980px × 2515px
Photo credit: © SBS Eclectic Images / Alamy / Afripics
License: Licensed
Model Released: No

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