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To my knowledge, all of the known re-pops have a cast bronze or brass head and are solid cast. In the hand these feel very heavy compared to an original Putter stem. The original's have a cast iron head that is partially hollow. Some of the re-pops have an angled quilled end instead of the horizontal termination. If any of these have been recast in iron I would love to know.
It would be great to have John, Shawn @Freqman1, or others offer their input.
I believe your Firestone (three quill) is one of my cast bronze reproductions I had made a few years back, that was copied from my original. I had originals of both versions and had a small number of both Huffman and Firestone versions made and oddly the two original versions were not identical in shape - varied slightly, at least to my eye.