This is becuase when set up the stop also sets a minimum spring power.
Do not pull out the crown unless yo want to set the watch.
Write this number down and compare it to the charts on this website.
This will give a good idea of the manufacture date.
I am slowly adding serial number tables to this site. With the exception of BULOVA, the numbers on the inside and outside of the CASE ITSELF are ONLY for identification purposes - they mean nothing.
If things don't go well, you might have problems connecting for a while, but rest assured that I'll try and fix any problems ASAP.You should consult the serial number table for the specific brand of watch movement you are trying to date by selecting a company from the menu on the left.Not all vintage watches can be dated using the serial number.Some companies (as with the Gruen Watch Company), even lost rocords to fire or other natural disaster. I am sure they had no idea that their timepieces would someday be collected.There are several ways to get an idea of when your watch was made.