Second hand R12 engine ID

[Chillout47]

I got this R12 brand new off a chap on eBay, car is in superb never used condition complete with engine. He told me the engine needs a new piston and liner, but I dont recognise the engine and it has no marks. It looks exactly the same as the engine that is illustrated in the R12 instruction manual. Any ideas? Cheers chaps.

[spud31]

axe rossi engine cant remeber name but was top 12 size engine at time