According to the registers of the Geneva Observatory, this extremely fine high-precision watch obtained a grade “A” rating certificate on 2nd August 1905 with 210.1 points and the mention "Honorable". The movement was prepared and adjusted by the renowned master régleur C. Batifolier.
The régleurs or adjusters were the highest paid workers in the watch industry because success in Observatory trials directly conferred reputation and prestige on the brand and therefore greater commercial success.
Patek Philippe movements when destined for participation in Observatory Timing Contests were engraved with the movement number twice. The inscription "Adjusted Extra" on the bridge of the movement refers to the high finishing of all the parts of the movement. Interestingly, the engraved monogram on the front cover of the present watch is almost certainly engraved by the same hand as the monogram engraved on the legendary highly complicated watch, the “Stephen S. Palmer” sold in 1900.