1971, P64 round or triangle hammer?

[bvd1]

I am new to P64s.I bought a 1971 several weeks ago that appears unissued, with a triangular hammer. I just read on another forum that someone bought a 1971 with a round hammer. Which is correct for that year?

[PA-Joe]

They made the change in the 71/72 production year so you may have a late 71. My 71 has a round hammer.

[robbins290]

I also have a 71 64. I bought it unissued "looked it anyways" it has a round hammer