Eric,
The American Eagle series production began in 1900 with sn 2002. They appear on the standard 1902 Fat Barrel and 1902 Cartridge Counter (50 made). They appear on the 1906 model in both .30 and 9mm., with proofs and without. American Eagle series production ends with the end of model 1906 production, in 1913.
American Eagle chamber stamps occur very sporadically on late-20DWM and Alphabet Commercial pistols, probably as special-order items, sometimes with Safe/Loaded safety and ejector marks. They are also often seen in conjunction with A.F. Stoeger receiver markings.
Considering all the possible combinations of markings and other characteristics (frame length, thumb safety, takedown, etc.) a complete American Eagle collection encompasses more than 24 different detail variations. You can see what each of these might be with close examination of the Commercial database.
--Dwight
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