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 IV (graphite gray) Floor-standing loudspeakers at Crutchfield
Bose 601 Series II Speaker - Woodgrain | Reverb Australia