Picked up a gorgeous BHP today!
i believe a PM letter code in the S/N means it was made in 1980.
The underside of grip panels should have orange finish and mag follower should be aluminum alloy. Gun like that usually brings over 700 in my neck of the woods. In addition to those features "first post WWII pre-Browning FN batch" also had internal extractor and thumb slot on front right side of slide.
And you would be correct on both counts.The underside of grip panels should have orange finish and mag follower should be aluminum alloy.