Studying other examples of these things and the carbs that everyone seems to cite, I notice there seem to be two styles of carb anyway, one with a metal float-holder and brass nut like the paper-filter Briggs engines used to have..
and one with a black plastic bottom, 3 PH screws and spring catch, as mine has.
Mine definitely has a u/s coil, all tests on the mower give a negative result for spark, dead as dodo, Im curious to see if the thing runs if I managed to get a serviceable coil, but with what people say re the carbs, and the valves and oil-burning, I guess chances of it running properly even if I got it to fire, are modest.
To aggravate that, this one also had a petrol tank half full of water, dont know how that got there, maybe kid's playing...naturally that water had flowed down into the carb, Ive dried it all out now, but with a carb reputed as 'sensitive"...sensitive is a polite word for temperamental POS that finds any excuse not to work right at best of times...
Added to that, even if the thing started and ran like a Swiss watch for me, Im reticent about selling the result on to some unsuspecting Schmo who is probably going to be let down by it before getting a decent run out of it.