Clutch Chainwheel as fitted to 350cc 3TA and 500cc 5TA, 4 Spring Clutch models from 1964 to 1966. This chainwheel is similar to the 57-1570 but have been machined for fewer plates (4 friction & 4 plain), hence why it is still stamped 57-1570.
MADE IN ENGLAND
OEM: 57-1442, T1442