Regina endless primary chain, this is a 3/8 X 7/32 duplex chain with 72 links. Direct replacement for Renold chain, but less expensive. Split, soft rivet and half links are available for this chain.
This will fit all of the following BSA models. B44 GP 441cc (1966-68),
B44VR Victor Roadster 441cc (1968-70), B44 Shooting Star 441cc (1969-70), B50T Victor Trail/B50MX 500cc (1971-72), B50SS Gold Star 500cc (1971-72).