I did not know what Model this Briggs & Stratton was, but members wrote and told me it is a Model R. The crank starter was I believe an option ( Gear Reduction ). Thank you to everyone who emailed me.

NEW in the box 3 HP Briggs & Stratton duct engine. The only engine Briggs built upside down.

This REO Flying Cloud mower I got years ago before I even know what I had. I got it from a guy I used to work with. I asked him if he had any old lawn mowers or engines ( I always ask everyone ) he might want to get rid of and this is what he brought to me. To him it was just junk that was laying in his way !