Thats for sure, However not all sheerlines were impulse start, and a sheeline is rare enough in itself.
The four star also had a valuable handle badge that was quite similar, and located in the same place, that badge would be worth similar dolars I beleive, but it's even less likely consideing we know the mower in question is a 2 stroke.
It's probably a Cortina or Corvette, and Even some of them are able to pull a little bit with the collectors, a 1963 Crorvette with the corect Badging, right air filter, and a good base would be worth a fair price, I myself am trying to track the 63 base at the moment.
