I'm picking up a 051AV this week from Facebook marketplace, will post pics when I get it in my grubby hands.
That'll loosen up yer teef & joints. Great saws, lotta grunt in the cut & fun to run if you don't have to sling it all day.
The 50+51 and 71,75+76 . If anyone gets one They should get a new complete set of gaskets. Especially main case gasket. They tend to wear out in the front and pressurized the oil tank. And sometimes can get bar oil into the crank case. Which creates plenty of different troubles.
Here's my 051 that I use for milling. Great saws...they just pull and pull and pull. They're heavy as heck though.