Not sure if this was posted before, but we need to get some!
This is called the CATIVA cylinder from what Ive found, used in Argentina on their v1 clone called the Zanella.
The kit is an aluminum cylinder with cast iron sleeve. Inner diameter of 48mm, with 5 transfers, 4 pedal reed valve too. The strokes its available for it are 39mm & 42mm. byby polini....
Anyone have more info? Seems like they run around $250 USD in Argentina.. (edited)