I've got an old mountain bike frame, probably from the mid-80's (based on the fact that it has a chain stay mounted U brake). The thing is, the frame was previously stripped and repainted, so there are no labels, stickers, or any sort of identifying marks. The geometry resembles a road bike frame (horizontal top tube), but with 26" tires. Mechanic told me the dropout was forged, vice stamped (which I assume is a good thing).
Is there any way to tell whether this is a quality chromoly frame, rather than a cheap pipe frame? It does have a lugged seat tube/top tube connection, not sure if that's any indication. The other tube connections are welded.
Trying to figure out if it's worth fixing up, or if I should start with a new frame. I've ridden it, and it fits me well.