Paillard suggested that the bi-metallic balance be constructed with a palladium alloy for the inner ⅓ portion of the rim and silver or another palladium alloy for the ⅔ outer rim. “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.” The patent application specified Paillard’s intent for the new balance: 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. Mine also has OMEGA WATCH Co SWISS, 17 JEWELS ADJUSTED, 2 POSITIONS on the train bridge-just as shown in the second picture.Ĭan anyone tell me what the caliber of my watch probably is? I don't have a picture of my watch because I've taken it apart.Pictured: Closeup of the Bi-Metallic Palladium Alloy Balance Patented by Paillard, From a Grade No. The second picture shows an Omega movement that looks almost exactly like my watch only mine is, as I said 17 jewels.

The logo on the train bridge is different than what’s on my movement. Also the movement in my watch is nickel(?) plated, not plain brass. I did find that Omega made a 40.6L caliber and the first picture looks a lot like the movement in my watch.

Now this could be a transposition of 406L. Judging from the engraving inside the case back, a lot of watchmakers have serviced the watch.14 kt, gold filled, 25 year case with serial number 4797529 There is another number on the plate: 26513.The last 4 digits of the serial number-9180-occur are stamped on the underside of the balance cock and the barrel bridge.This number is stamped on both the plate and the train bridge. It is consistent with a database of serial numbers I found which would date the watch c.1916. 5119180 which I presume is a serial number.Serial number look-up example: Let's say you have a Waltham watch with serial number 21,607,210 as shown in the photo below. Here's what I've found on the movement and case: So to determine when your watch was manufactured, you will need to find where your serial number fits within the range of numbers. I'd like (among other things) to know the caliber. Hi! I have an Omega pocket watch which I'd like to fix.

Omega pocket watch serial number lookup