I have a 111 but have never checked the ports on it to see if it is open or closed.
Also would be interesting to note how the closed port runs compared to a open port. If any kind of power difference that is noticeable.
I have rebuilt/owned several of these saws.
With my experience, the closed port has a more crisp sound with better throttle response and a little more power.
I especially like a closed port cylinder because piston has more "wall support"
As I said, My favorite saw is my Pristine Dolmar 115. Starts with one pull if I am fast enough to release choke and is one of the smoothest running chainsaws.
Dolmar got it right with the 115