Hard to tell without a letter.Box if present will be marked USED GUN and may have a secondary label FBI Academy.FBI gun had Nite Sights but so did LE contract guns.Bottom of trigger guard may have a very small U for used gun.1076`s seem to be pretty strong lately bringing close to a 1000.00 on the auction sites.Good Luck.
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SWCA#2288
SWHF#407
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