Thanks Dairwin. Any idea to aircraft type it would have been used on? Off board I had a fellow tell me some of these parts are harvard and yale?

Peter – if it is a booster coil, then there are several types. The voltage is engraved just below where the jubilee clip is! If it is 24v, then you will find 4 of these on your Lanc :diablo:

I believe they would have been used on lots of piston aircraft, but do not have any further information.

DAI