The large movements with 18o, or sometimes, but rarely with 18H calibers, were made to the highest possible standards and were specially adjusted by such masters as Henri Wehrli, J. Golay-Audemars, F. Modoux, and C. Batifolier. They were the best paid workers in the watch industry. Watches adjusted by them, especially those awarded prices at the Observatory Contests, were several times more expensive than the regular ones. The present watch is exceptionally well made, adjusted for the Observatoy Contest, and engraved on the pillar plate and bridge with the serial number, which was one of the prerequisites of the Observatory Contest rules.Every detail, such as the special Guillaume balance with small "wings" at the arm for poising "in the raw". (before the screws are put in), which assures that temperature compensation adjustment will not affect poising, superior polish of the steel parts, olive jewel holes, and the very light undercut escape wheel with raised teeth, shows that the watch was a special one. The fact that the dial is signed "Chronomètre" is another clear indication that it was a special watch.