First of all, I accept the fact that I gave American Gladius more credit than it deserved. The correct way to have phrased my statement is, the first time I encountered the Generation numbering i.e. Gen 1-4 was in the book American Gladius, not that the author started or invented it.
I also agree that the timing of when the Pat. Pending stamp was actually used on the M9 is still a mystery. Thanks for the info. Whether or not these variations are "blue print" changes or simple cases of casual changes of convenience, they non-the-less represent a legitimate and interesting area of collecting of this great bayonet.
Marv
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