I picked up that model 6 today and figured I'd post a couple of pictures. The Model is 6, the Type No. is 105173 and the Serial Number is 481825. Based on that I believe the correct manufacture date is October of 1954. The engine looks great. The tank is nearly perfect with very little surface rust inside, should clean up easily. I haven't attempted to start it but I can tell it has very strong compression and good spark. It had been stored in an attic but it appears that it was drained and prepared for storage. I'm wondering if I should go ahead and break it all down or put fresh oil and gas in it and see what happens. The perfectionist in me wants to break it completely down but I'm afraid if I do I may end up needing gaskets and other parts that I don't have and will be very hard to find. Opening a can or worms, you know, not sure if I should or not.
Also, when did Briggs introduce the recoil starter? The recoil starter appears original on the housing but I wasn't sure if that was standard in 1954. Judging by the photos, does this engine look correct?