I believe this is exactly the as fitted to Alvis Speed 20 models that used dual ignition. I has three positions, the middle for "Off" and one either side for either mag or coil. The spindle comes through the back to be connected to the H.T. change over switch on Alvises.It is marked "AM" under a crown but it is not an Air Ministry mark as far as..
Complete 1125cc Austin 10hp T head engine S/N 161
Manufactured late 1911.
Very good inside, gear train perfect, bearings feel tight.
Very well made and seems to have had little use.
Magneto overhauled.
Good compression but would benefit from having the valves lapped.
Carburettor is a Zenith, I beli..
An original Bosch ignition coil, marked TF6/1. It is key operated (no key) at one end and has 6 connections on the bakelite end. Complete with original mounting bracket. Buyer pays shipping costs.