The lettered 1076 I have was initially shipped to Quantico, then back to Smith and then resold to the Virginia State Police before being surplused.
Spring for a Roy Jinks letter and then you'll know...
Just picked up another 3906 with three mags and owner's manual for $370 OTD. Wasn't really looking to buy another one, but the price was tooooo good to pass up :)