It is somewhat sketchy, with serial numbers listed in round millions and not shown for every year, but rather for each million.Ī better known serial number/date list was presented by Roy Ehrhardt in various publications as far back as 1976. The earliest date chart that I know of was produced as a front page in some versions of the gray book, Waltham's list of serial numbers and movement descriptions from 1954.
What source do you rely upon for dating Waltham watches?
