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The date wheel font is different between c and d isn't it? That may help assuming date wheel is original.
have fun
kfw
If this is correct information this is really valuable information to help with the 2500 C and D movement questions regarding the date wheel which pop up from time to time. Thanks for sharing.
Does it even matter if it’s a C or D? I thought that when these were serviced any needed changes in the C were made, essentially making it a D. Given this watch is 15 yrs old, I’m hoping it’s been serviced.