New and interesting information about Wheelock electromechanical horns

I actually have an open-grille pigtail 30-series horn with a smooth, glossy finish (a “33-24” specifically), along with two closed-grille “textured” matte 30-series horns: a standard 34T-24 with terminals, & a “34-24” with pigtails. The 7002T-24 I have also has a “textured” matte finish to it (it has a closed grille & terminals like most 7002T-24s as well, though I’m not sure if the 7000-series was ever offered with pigtails, if they were they must be very rare).