British guard on a motorcycle with a mounted Tommy Gun, WW2, 1941
setsneedtofeed, 
Looks like a Model 1928 Thompson, a pre-simplification model.
THEMASTERMIND, Tommy
Showroom7561, Accuracy = -90% 😂
capital, Guessing throttle was on the left?
tiredofsametab, Could also have some sort of throttle-lock type of situation on the right. I'm not sure, though.
zcd, If that was a BSA M20 I think the throttle would be on the right. Maybe It was relocated for this application?
Brkdncr, I’ve seen cop bikes from this era with a left throttle, also for shootin’
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