![]() 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: They continue to about 6,100,000 in 1973 when they changed their serial numbering system. ![]() It looks as if the numbers are a continuation of, and are combined with, the General Watch Companys pocket watch serial numbers. 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. Helvetia serial number marking on their watches appear to start at about 2,000.000 in about 1914. 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.
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