ESS Heil mystery


2005-08-06 2:05 pm

I recently purchased a set of AMT 1's at a garage sale. They looked to be in very good condition, but in need of refoaming. The person I bought them from said he thought he originally got them in the early to mid - 70's, and there is some accompanying paperwork dated mid-70's. However, on removing the woofers for refoaming, they are both dated on the baskets June 17 1980. Does anyone know if these are the original and/or compatible baskets? They also have numbers on the baskets: 680-1021. Thanks for any help!