Busy with work BS. Going cutting on Saturday. That looks like a Super XP1020A (like JP said). You can just see part of the "Super" above "XP" on what's left of the logo on the tank top behind the fuel cap (to the left of the oil cap). That's the last of the XP1020A's, and basically the same saw as an early 1050A.
The puzzling thing about that saw is that the original idle circuit has been defeated, but I can't see the hole in the airbox for the idle screw. This saw may be a mix of a 1050 and a 1020, and that would explain where the updated carburetor came from.
Edit: Maybe some Super 1020A's came that way. It is possible, I guess. That air idle screw actually works pretty well, but it clogs up the airbox, and makes the saw much more difficult to work on.
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