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I have a 1950 longbranch with a #3 bolthead. The rifle had not been fired when I got it. The factories all used parts from everywhere, that's the way it was. Don't beat yourself up over this, it's just a rifle!
Why are you worried? It obviously came from the factory that way. Have you read the 1950 Long Branch survey stickied in this forum? Keep in mind there is only one 92L rifle in the survey, and note the overlap of blued to parkerized rifles.
Yours just happens to be an "early" parkerized rifle.