It might be worth a few bucks to somebody that collects that sort of thing. That is similar to the first engine I took apart at 13, I got it running but it screamed like banshee. I hadn't learned about governors.

romore,
I fixed the governor in this mower several times.

Is that an 'RPM' label on the front of the deck? The 'Rotary Power Mower' Co. was founded by the inventor of the rotary power mower sometime around 1950. He was unsuccessful with his early models until he teamed up with Evinrude of the 'Outboard Marine Co.' who was making vertical shaft 2-cycle outboard engines. It was at this point that they came up with the brand 'Lawn-Boy'. A little later OMC bought out RPM entirely and they dropped the 'RPM' from the brand. So, an 'RPM'/Lawn-Boy represents the first commercially-viable rotary power motor. Sears began to handle them and subsequently carried the Lawn-Boy line into the 1990s.
Yours might be worth repairing (broken deck) and restoring. As is, I would venture a guess that you might get $100 for it.

saxman1

It is a "RPM" logo on the front of the deck. I remember my Dad saying this was the first rotary mower for sale. I think he bought it at a private shop (make from Sears) for $99.00. Since my birthday is in March 1941, he bought it when I was 11 or 12 and was in Little League. We used it to mow the Little League field and many many other mows as you can tell because the treads are wore away from mowing lawns. That is why I think it is a 1951, 1952 or 1953. The strap on the gas tank is stamped MOD A10, which I think is the model of the motor. I could find it at this website: https://lookup3.toro.com/ttcGateway/...als/lball.html

The A10 refers to the engine model. A10 was the first RPM lawn boy introduced in 1953. As Sax said, Outboard Marine bought RPM out and, in 1955, introduced the first C engined mowers. Your A10 model was followed by the A11 and A12. The A engine models lived on for a while after the C engine was introduced.
Your mower may well be runnable. I would pull the spark plug and, after shooting some oil into the cylinder pull it over with the plug connected and grounded to the case, see if you have spark. If you do your half way there. The A10 model has a Tillitson carb which I'm not familiar with but a check of the fuel bowl to make sure it's not gummed up (as well as the gas tank). If all looks OK put the plug back in, give it some gas and a shot of starting fluid and see what happens.

'Saxman, I thought I was the oldest MOFO on this
forum. You've got me beat by 7 freakin years.'

How do you know how old I am? It was 'geoboy' who said he was born in 1941. :) But I have to admit I probably am still older than you.

If geoboy is 71 and and lbpod is 64, if you can remember your age saxman, you should should be able to determine if you are older. Lol

Just remember, KIDS, ony 15% of the population
of the world is over the age of 65.
(world population is 7 billion).

Thanks bogman for the info, I am going to use 1953. I was 12 then and my last year of Little League. Remember my Dad saying that this was the first rotary mower. I just
now have to decide what asking price when I sell it.
I guess I can claim to being the oldest guy on here unless saxman1 lets us know how old he is.
Thanks a lot for everybodies help.

The strap on the gas tank is stamped with MOD A10 SER 001152. I think it is a very low serial number and one of the first motors built. I do not know the serial number on the mower or where it may be.

That looks like a great candidate for American Restoration. You should send that picture to the producers of the show, they may sign you up.

Are you going to list this mower on ebay? I am interested...

I just put it on ebay about 5 minutes ago.

How much did you get?

Oh probably not much 8 yrs ago . Nice mower and even better story !

Geoboy; I wasn't 12 until 1957 so you are more of a geezer than me if that's possible!