Bose 601 Series III speakers (1986-1994) found in a thrift store. They are very sought after and are worth $1k to $1.5k online! They sound great. : r/ThriftStoreHauls
Bose 601 Series III Main / Stereo Speakers for sale online | eBay
Bose 601 II speakers pretty nice pair 601 II 70s - Vinyl | Reverb