Got a frame. Looks to be a Magnum. But...some of the frame pipe is larger diameter than expected. Certain details not consistent: Engine bolt-on web design inconsistent and there is no frame part on right side of down tube from neck to guide cable. Those are the major ones. Seat supports look different too.
What clinches it is serial number: begins with 320...not 160... as all other ones I have or have seen.
I am thinking it might be a one speed Cobra frame from the later 80s shortly before Puch's closing. Am I correct? Anyone seen this before? Any idea on time lines of production?
No name plate on head, so I can't even read how many or what digits are beyond first five or so. But definitely begins with 320...