Originally Posted by Ben Cartwright SASS

Emailed the Historian and he got back to me in a couple minutes. Here is his reply
"It's Boston Police they might have sent it to the Dorchester District always has been Boston Police. Just like they call the East Boston Police."

I would think an actual factory letter would say Boston Police, but no guarantees. All BPD guns were stamped BPD and a rack number, even the target guns. I wonder if there was a stamping on the backstrap or butt (they usually were marked in one of those two places)

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