Inner caseback is stamped "5512 " That's period-correct but of course not model-correct. I was told that Rolex sometimes used "5512" casebacks as replacements for 1680 casebacks, but supposedly those 5512 replacements didn't have date codes. I doubt this ...
As long as your serial range is good. a great refence report. www.watchprosite.com If you have a 1675 case back issue i may have been able to help. ...
... on the 1675 front (stamped 1675 and ). I hadn't seen the old 1680 reference post in a long time. Thanks for reminding me about it. It allowed me to learn a bit more about my watches.