I'm a fan of the early-A's. I can't answer your question, but it did pique my curiosity so I started to look around. This is regarding D-Darts, so it likely won't answer your question, but good reading about the 66's.
https://www.forabodiesonly.com/mopa...t-mystery-myth-and-misconception.263637/

Last edited by Fat_Mike; 11/29/21 11:34 PM.