"Extra" quality watches 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 who were the best paid workers in the watch industry. Watches adjusted by them, especially those awarded prizes at the Observatory Contests, were several times more expensive than the regular ones. The present watch is exceptionally well made, almost certainly adjusted for an Observatory 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 specially adjusted 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, the superior polish of the steel parts, the olive jewel holes, and the very light undercut escape wheel with raised teeth, shows that the watch was a special one.