The crown is aproximately 7,2mm in diameter, so it will be easy to distinguish it from a 12.68Z crown I guess.
You have a 13ZN from 1936? 5'3xx'xxx serial number? I do not think that this crown would be correct for a non-waterproof 13ZN case.
As posted in a separate thread.... a new arrival (more pics in that thread). Dennis would of course make copiously fun of me for double posting so shamelessly. But hey, this one’s worth it. Best regards, S
Wanted to share this macro of the goldmark on my new arrival, (quiztime) does someone recognize it? Hint: on an art deco 'Fab. Suisse' dial Longines
Another day with this 1952 before sending it off to WM for a cleaning and service. The problem is, the more I wear it the more I like it, and the more distant the date becomes for sending it off to the WM.
Oops! IPhone notified me that “an error occurred uploading your file”. Let’s try resending the photo.
Currently my only Longines. Sharp 37.5mm, oversized SS case, bauhaus inspired styling, and blued hands. Delivered to Italy in 1941.