Brass circular flat "knob" about the side of a 10cent coin?
British FV vehicles of the 50's (Champ,Humber etc) use a 2 position locking "Choke".
If it is one of these they are not hard to find. Either way, as suggested, Tim should be your first port of call.
Rich.
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C60S
Austin Champ x 2
Humber 1 Ton & Trailer
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