Anything to look out for with B+S Major?

the AC number refers to the machine, which in this case is a merry tiller, made in good old blighty.
Briggs and stratton is the the make of the engine only, which is made in the the usa.
providing you dont get loads of smoke from it, and its feels like there is a reasonable amount of resistance when you pull the starter rope and there isn't too much oil leaking from it, its should be a good one.
wonder why it was painted black?