I was thinking Type 4 because the dash 4 at the end of the serial number.Well this is back when they played with the CC on the labels. The 220 was listed as 38cc and the 260 listed at 42cc. Both used the same PNC and crankshaft assembly. So basically it is a 42cc. And yes it is a type 4.
https://www.partstree.com/models/pp-220-poulan-pro-chainsaw-type-4/engine-type-4-1/