Servicing marks in watches
Guys apologies for an early question, now all accredited watchsmiths when servicing a watch will/would leave a series of numbers scratched into the caseback when said watch was serviced.
I'm sure this question has been asked in the past, but what do they mean? Can you tell what year the service took place etc or is it just an individual number given to the watchsmith on completion of training?
I'm asking this now as I have this watch on my bench that the customer has sworn blind it's n
Case marks are interesting for the most part everyone has their own system. Including some companies were using felt pens so as to not to leave a permanent mark. But the last I heard they were concerned about the fumes from the permanent marking so I have no idea what they're doing now.
So what did the secret codes mean? One shop I knew of the numbers referred to the logbook. In other words it give the page number and I think the line number. Others secret codes for what type are repair was