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.Serial number records are available for many of the old pocket watch companies like AM Waltham, Elgin, South Bend etc. The number you need is the serial number stamped on the MOVEMENT (i.e the inner workings).The Ultra Thin models were part of the pricey Dietrich Gruen line, which will be described later.
In 1867 he went to America and settled near Columbus, Ohio.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.Write this number down and compare it to the charts on this website.This will give a good idea of the manufacture date.