You should go get it! That style is the early Lauson single (1940-47) commonly referred to as the OB-410. (They actually had several model #s but most just use the OB-410 designation) They can usually be coaxed back to life; stuck rings and valves are common but can be freed with patience – most are missing the back motor cover, nice to see it’s still there on this one. They run okay, like every 4-stroke they are most enjoyable at idle up to 1/2 throttle – after that they can be noisy and annoying. No impeller, water cooled only – that exhaust tube can get hot…. 😳