Well, I sure am glad to see that I am not the only person interested in these little gems.
View attachment 45885 Hopefully you can see my picture. The two in the picture (in the picture) are indeed in my possession. 131.8430 and a 131.8532. I have had very little luck finding much info on these machines and in my free time I still dig around on the web a little. I have somehow got lucky and found the owners manual and parts list on ebay at one point. I also know, after digging up some vintage sears ads, that they were sold from 1966 to 1968. The older ones have a 3/4 steering wheel and non gear reduction steering. Whereas the later ones have a full steering wheel and gear reduction steering. Along with a structural change to the vertical brace holding the dash panel. The engine is a v60 tecumseh 6hp. Most of the engine parts are still available new except the muffler, fuel tank and fuel guage.