The grade came from research of serial numbers. A pocket watch or pocketwatch is a watch that is made to be carried in a pocket, as opposed to a wristwatch. Serial number and store are engraved on the inside workings. Pocket Watch Serial Number Lookup Database. This Antique Pocket Watch was made in 1894 with a serial number of 57441 and is Grade 975. On Offer is an Antique Hamilton Pocket Watch S18 size Gold filled case. Be valuable to use the table that is specific to YOUR brand of watch when looking up your serial number. “The object of my invention is to produce a bi-metallic compensation-balance which will not be subject to magnetic and climatic influences to heat or cold, nor affected by or subject to rust or corrosion - in other words, a compensation-balance practically, if not entirely, non-magnetic, inoxidizable, and non-dilatable.” Antique Hamilton Pocket Watch S18 Gold filled case. Your movement serial number may not be in exactly the same location as the one in the dating, but you are looking for the antique number that is on the watch mechanism itself This is an example using the Waltham serial number database. On The Block And Taking Bids Is This Antique Elgin Pocket Watch Serial Number. The patent application specified Paillard’s intent for the new balance: Enter the serial number into an online elgin serial number database to. At the time, conventional compensation balances were constructed of steel and brass, allowing for controlled expansion and contraction during temperature changes, precisely adapting the oscillation rate to compensate for metal dilation. On March 8, 1887, Charles-Auguste Paillard was granted a patent for his palladium alloy compensation balance. Pictured: Closeup of the Bi-Metallic Palladium Alloy Balance Patented by Paillard, From a Grade No.