Dating a pocket watch
Someone has bored out the frame out so that a model '88 now fits.These are generally the easiest as for many makes, such as Waltham and Hamilton, production records are still extant and enthusiasts in the US have put a huge amount of effort into putting them into online databases so by taking the serial number of the movement (not the case number!The town of Waltham had become well known, and the name appeared on all of their watches as the location anyway.So, you'll either have to find a longer stem for a pendant set movement or cut a slot for a lever set movement.
Generally it is therefore necessary to reply on silver case hallmarks or when in a filled or rolled gold case to compare with previous dated examples which may not be as reliable.Not only was this process time consuming but it was also a very expensive […]Continue reading…Webb Ball established strict guidelines for the manufacturing of sturdy, reliable precision timepieces, including resistance to magnetism, reliability of time keeping in 5 positions, isochronism, power reserve, accompanied with record keeping of the reliability of the watch on each regular inspection.Write this number down and compare it to the charts on this website.
This will give a good idea of the manufacture date.Are more problematic, of the makes I regularly deal with, Omega have published the dates that each million watches were produced so by interpellation the production date can be determined within a year or two.Dates are known for Zenith and some for Longines, & Baume.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.