Used in the legendary Spica TC50 loudspeakers. I've found that they were also used in a Californian speaker from the "Lancer" company, a 3-way with 12" woofer bookshelf type which have to have been from the same time period. Useful to know of a source for potential harvesting...and I don't mean the JBL Lancer speakers or the early Lancer speakers with classic coaxial drivers, etc. I can't even find photos of the things through different searches.
