It was a Lucas MC45 dynamo on the Sunbeam S7 and S8, similar, but with different drive arrangement, to the ones fitted to the last (coil ignition) Shipley Scotts, and also on the early Birmingham Scotts. The later Birmingham Scotts had Miller electrics and an alternator, which was a much slimmer device than the dynamo. The method of mounting on the Sunbeam is different to the typical Scott crankcase door and drive disc. I don’t know which type Eric is referring to.
Brian
