You gotta love these old Traynors....I will share that I jammed with my son's band yesterday through my dusty old Traynor Mark III Combo. I put an overdrive pedal in front of the 100 watts of old Traynor juice-- and it shook the house. Now my kids band wants to borrow the amp for a gig.
There are an unusual number of early Traynors missing their logos. I think it was a pretty common thing for a lot of years to "de-logo" one as soon as you got it. I would check ebay although they are expensive as doctorx mentioned.