Thats an early one Richard, is it your plunger or the rigid ?
This is the date stamping I am interested in. What I am trying to find out is exactly when it is stamped. ie when cases are machined or maybe upon assembly of the engine.
I just bought another plunger model A10, pick it up tomorrow. Unrestored and definitely a basket case, probably going to need several baskets to put all the pieces in !