Is anyone familiar with early '70s fretless jazz necks? I have a J-bass that dates by serial number to 1974, but I can't find any pictures of fretless basses from that era to compare to, so I'm not sure the neck is original. The headstock logo is correct for 1974. The stamp on the heal is almost gone, but the first three numbers appear to be 020. The word WEBRIGHT is stamped on the base. I see from a Forum thread from 2006 that this has been seen before on an early '70s P-bass, but no one was sure of the neck provenance on that one. There seems to be a lot going on in the neck cavity on the body, which makes me wonder if the fretless neck was a conversion. (The Bartolinis and Badass were the upgrades everyone did in the '70s. It's all as it was when I bought it about 15 years ago.) Pictures below. Thanks!