LOST P11

This 1968 Norton was taken from a impound lot for Aurora Police 1982-83 in Aurora Colorado after it was impounded for no lic plates. The story go as follows, it was originally the Flat Track racing Bike of Racer Billy Snyder a Colorado legend. It had a matchless frame with a custom tank. In it past lift it had been owned by several Denver Bad ASSES Bob Hayes, Mike Hayes, Tom Grubesic and one other. I ended up with is in 1980 and when I was pulled over for exceeeeeeding the speed limit and straight pipes and did not have all the 411 or a DL handy, it was impounded and I never was able to recover it. I would appreciate any info about this bike.
The frame was nickel plated !!
18'' rear wheel / 19'' front wheel

hi,,, i also have norton p11 1967 with matchless frame.... engine number p11/122989 and matchless frame number is A76125... what about your engine and frame number... does all norton p11 1967 are with matchless frame?.. what frame number was start from for norton p11 1967?
Cheers