Here is a closer picture of the skytone pin caps. They are (left to right) a 1985 Victor, a 1988 PPCo, a pair of NGKs from 1971, a new Gamma, a pair of Chances from the 60s, a 1980 McGraw Edison, a 1992 Victor, and an Ohio Brass from the 60s or 70s. The spools are unmarked.