Ah, well, I am learning how to service watches, having completed about 4 now. And finally the outcome is one I am happy about. But someone gave me an Omega pocket to see wht I can do with it.. And I do want to succeed in the challenge. The watch is of sentimental value to the person who asked me to look at it. The serial no 4301181 dates it to 1912. External case diameter is 47mm. The issue is that I have this what I believe to be a 18 ligne movement, simply because the width of the m