3 Answers

Sounds like a mine field i would not like to cross..>>>>>>><<<<<<<<..

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The entire case body is also completely different to the better known 2497 style as thinner in link height and less convex. Furthermore the bezel is slightly convex link whereas the normal 2497 is concave. Also the case back has its unique design and link does not compare with any known shape of other perpetual calendar models from the period.