![]() ![]() ![]() Note that this selection process might permit a bridge to sit in a bin for years before being used. No one takes the time to remove them from the bins in order i.e., first in, first out. As they are machined and engraved, these individually numbered bridges are collectively placed in parts bins awaiting assembly into the movements.ĭuring the assembly process, these numbered bridges are randomly selected from the bins and installed along with the other parts. (On later model Speedy Pros, this number is also engraved on the back of the 7:00 lug.) Most refer to this as the movement number but more accurately, this number should be called the "escape wheel bridge" number. Here's the problem with using Ryan's chart (or any chart for that matter):Įvery Speedy Pro has a unique number on the escape wheel bridge. ![]()
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