Hi Stan
Thanks for coming back to me. Sorry dont have the opportunity to photo the bike just yet. But I can advise that the engine number and frame numbers match. The engine has an IRZ carb which is a stub fitting.The outside fins of the head are not split which I have read both those things would indicate a MAR MK2? But whilst the bike has no lighting wiring that is apparent and no head or tail light. It does have some wire headlamp supports with a coil twisted at the top and bottom around the fork stanchions between the head yokes (rhe pair of wire brackets match and appear to be factory manufactured). I have seen photo of these brackets on a a TR77? I have heard of bitsers but this one has me stumped. Hope the above helps in the absence of photos at the present time
Thanks
Bob