Pennsylvania was the home of Miller triggers. It is a very big trapshooting state and trapshooters were the biggest customers for Miller triggers. The Miller brothers were prolific trap and pigeon shooters and saturated their market in areas close to their shop. The beavertail forearm is another clue since the original forearm on your Parker would not be a favorite of trapshooters because it allows the hot barrels to burn the hands when the gun is shot on the trap range.
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