I am not sure about the political-correctness, or the racial implications, but that is what the WERE called. Those look exactly like the heads I bought in 1979, my fist season to work albacore out of San Diego. The heads look exactly the same, and each one was wrapped with waxed thread, around white chicken feathers, with a cat-gut protector over the thread. I bought a box of them that were in yellowing packages the read "Japhead Trolling Lure, Imported".
They guy I bought them from said they were 20 years old, which would make them about 50 years old today.
Anyway, as you noticed, they are really heavy for their size, which keeps them down in rough albacore weather. I was running them on boatlines on sport boats, and for commercial fishing, so I wanted to thread them on 300 lb, but now way. They have small holes, that I doubt you could get 150 through--how about yours?
It may be hard to believe, but these things held their own in the spread, and would often get bit better than the hottest jigs of the late 70's--the Zuker.
Hold on to those babies.