Hi
My every day mower is (or was) exactly the same. Its on its third engine now, the original B&S 4hp, a second B&S 3.5 hp and currently an OHV 400 Sanli (or Chonda).
Its been a good mower (a 1979 model)
Yours might have a better engine though. Mine never had the I/C logo on it. That means cast iron bore doesn't it? If so your Briggs should go forever.
Wheels are a bit of a problem. The original cast wheels eventually break up. New (or SH) original wheels) are very expensive. I am currently running later model Rover rear wheels using the inner race of the old ball bearings to build up the shaft size.
My catcher is still working but has been repaired many times. The alloy deck is just starting to wear through where it scrapes against our brick fences. That might be the eventually be the end of the mower.
Yours looks as though it has not done much work. You are very lucky.
All the best
Jeff
