I was invited to tour a eBay seller distribution facility from a guy I met a few weeks back. He bought out another dismantler facility and is just getting started. Huge inventory most of which isn’t up yet. I helped him determine and value a bunch of Yamaha parts but there are probably 100 bins which we couldn’t get to so I’ll have to get back over there again sometime. I had hoped to locate a few parts for my own bikes but just came away with a high beam pilot and plug for my DT1 which I traded back for a tombstone tail lamp I thought was for a CT1 but ended up being for a CS1. There was a pretty nice heat shield which I couldn’t determine. Thought it was a Suzuki but so far can’t confirm. Anyone know?

Presumably no stamps or castings on the inside? They can get covered in rust and dirt.

The circles remind me of Suzukis as well. The fixing screw pattern will provide confirmation as and when you find some possible fits.

Suzy TS400 i think. Had one years ago for a short time & reminded me of mine. 
OK hold that thought, similar but bit shorter, not as many holes as the 400.

 Try TS185 about the same era, early "70's.

 

RT325 is on the right track. The TS125 has the same number of cutouts and mtg hole layout.