Welcome! There are many model 64s currently on the market, mostly with 2" barrels, that are surplus from the California Department of Corrections and are in the $400 price range. CDC could stand for many other agencies, however. The ANB prefix means it probably shipped in 1986.

I have not seen one with a lanyard ring but these are easily installed; one clue as to if it is original is the serial number on an aftermarket addition usually goes through the stamped serial number. Hope this is helpful.

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Alan
SWCA LM 2023, SWHF 220