1969 BSA 750 Rocket III. Bought it out of a chicken coup storage room in 1974 for $500 It had around 3,000 miles on it. The P.O. got scared and parked it. It was so dirty you couldn't tell what color it was. It was a working chicken coup It required many hours with steel wool and semi chrome to get the metal parts to look respectable. Those batman mufflers produced the nicest sound I have ever heard from a stock bike. A low booming sound without any sharp tones. The sound probably radiated from the flat sides of the muffler acting like the heads of a base drum.