The first reported N. Gamse movement is found in the first run of Model 92 private label movements. It is perhaps the most intuiging because it is marked with Gamse's name but does not say "The American Leader". Gamse contracted with several manufacturers but according to Mike LaForest, a collector of Gamse movements, movements from this run are the earliest known. This variation would be distinguished by the serial number being in Position One, having 2 barrel bridge screws and the round hairspring stud.
12652001-12652200 AML21-H-V2 Variation 2 of the hunting case movements are found with the serial number in Position 3, Patented Waltham Stud, and the upper balance jewel screws in the east/west orientation. It is interesting to note that these movements appear in a run that the Gray Book lists as being the first run of open face No. 845 movements. Also note the "5 Positions" marking which does not appear consistently on Model 92s until the 14 millions. These movements, and subsequent Gamse movements, will carry "The American Leader" marking.
17187501-17188500 AML21-H-V3
Variation 3, the final variation of hunters, has the Case Screws in the Edge position, the Split Click, the 08 Patent Regulator and the Groove. These movements will also carry the "5 Positions" marking.
Open Face Movements
7902501-7903000 AML21-O-V1 Variation 1 of the open face movements occurs with the serial number in Position 1, two Barrel Bridge Screws and the round Hairspring Stud.
12028501-12563050 AML21-O-V2 Variation 2 of the open face movements have the serial number in Position 3, three Barrel Bridge Screws, the Patented Waltham Stud and the upper balance jewel screws in the east/west position. These movements occur in the following runs;
15084501-16059500 AML-O-V3
Variation 3 open face movements are distinguished by the case screws being in the Edge Position and they are the last American Leader movements with the Solid Click. It would appear that the "Ruby Jewels" marking is dropped at this point. They occur in the following 2 runs;
16196701-16197000 AML-O-V4
18053651-18054000 AML-O-V5 Variation 5 movements have The Groove.
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