Just got an email back from the guy with the old Mac. Apparently it's a D30 - pretty much the same specs and vintage as the D36 you gussed, according to Acres', so I'm not sure what all differentiates the two.
I was very interested in the description of the "automatic" oiler:
"Manual oiler added after initial production. Oil is extracted from the crankcase and is fed to the bar as the automatic oiler but does not work unless the 10:1 oil mixture is used."
Well, ya can't fault the old-timers for not coming up with creative ideas! That sure sounds like a hare-brained one, but it must have at least sort-of worked to make it to production. But how could they pull oil from the case without in effect creating an air leak? I can't see it working for me though - I don't think I'll be mixing 10:1 anytime soon. I guess I could use that saw when the mosquitoes get really bad next year though.
Is that the manual oiler plunger right below the oil filler cap at the front/side of the saw? Crazy impractical place for one to be if so, but apparently it was an afterthought.
Would $40 for this thing in non-running condition be out of line? He says it has spark and isn't seized, but seems to have a carb or fuel issue. Could be as simple as a new fuel line, but it could also mean needing to find an obscure OEM rebuild kit for some rare proprietary carb. I'm not sure what the case would be - I know some old Macs could have either an actual Mac carb, or a Tillotson. If it wasn't such a unique-looking old antique, especially because of the center pull start, I wouldn't be so interested in an old non-runner. $40 doesn't sound ridiculous for a nice collector piece like this, IMO.
PS - love the "muffler" on the one on Acres':
Pretty much a straightpipe for all intents and purposes!
Man that thing must bark!