Stihl 028 or 028AV, not sure exactly which. Cross referenced against a few part numbers.
Starts and runs but carb is gunked up. Missing some components as shown. Pulled exhaust off and checked piston from exhaust side, shined light down thru carb and piston shows normal wear, no egregious scoring. Has one cracked fin on jug as shown. Good for parts or refurbishment.