Local seller, no model info. Calling it a "Johnson", with a 20" bar. I was hoping someone would be able to identify it. I just don't see many "Johnson" saws. Anyone?
Don't know if this helps at all, probably doesn't, but i can say with 100% certainty that it does not look at all like my "Johnson" or any other "Johnson" i have had the misfortune of seeing.
Jonsered 630 and 670 are great saws. Very durable; great power. The only thing beat on it that see is the top handle is bent back. I'd grab it. Lots of them (and their Husky cousins) come up for sale cheap with "no spark." Don't be afraid of the two piece ignitions. No spark usually is a result of the wires becoming cracked and grounding out on the case. Real easy fix. Keep us posted.
They were made for quite a while, and there were some rather large changes/updates during production - so be aware that the dating of spare parts may matter.