I believe the Allis models were 195 and 295. Either one, same as the 306.
Whatever you do with it, be real careful. Thsoe things are worth around $175 vs. about $30 for a 306. I watched on eBay and then sold a mint one for $185.
I haven't switched from Pioneer to Allis. My next door neighbor is the Allis collector. I ran accross this saw a couple of years back. I have seen them sell on ebay, they are a great collectable item.
On his the piston and cylinder are scored. I would like to locate replacement parts.