CALENDAR DATE DISC INDICATOR FOR ROLEX GMT MASTER 3175, 3185, 3186 116710 WHITE

It is made for Rolex Gmt, Gmt II, Explorer II Datejust, Two Tone QS and others. Watches may share a visual resemblance, yet variations in case size or year model can distinguish them. Q: How do I check what case number and/or serial number I have on my Rolex or Tudor?.

eBay