A nicely made Stuart Score - for some reason I don't understand, this doubled up version of the 10H is very much rarer than the "Double Ten", a doubled-up 10V. To my mind it's a nicely proportioned engine, the world needs more of them.
There is a fracture to one exhaust pipe union.
Length 6 1/2inches
Width 5 1/2 inches
Flywheel 3 1/2 inch diameter