Hi Necron 9D9, this certainly looks like a Hindle to me as well although it came in the current shape with the faded badge. It looks a bit rough so I may give it a polish.
It does indeed have the spring connectors. Hindle was always sort of a second rate manufacturer compared to Yosh/Arrow/Muzzy. Is this not the case?
You can give Hindle a ring over there in ON and see if they have a replacement badge still hanging around. They had a fire sale a couple of years ago to move their vintage stuff but still may have parts for your pipe.
I would definitely not consider them to be 2nd rate; bought a 4:2:1 myself for my L1 I was racing back in the day. Their tag line when they came out was "Built from Jets" or something like that as Hindle was an aerospace guy before opening his own shop. I went with them because I had read an article in Roadracing World IIRC and it was explaining how he did not release a pipe model until they got better power out of it all along the curve vs. stock. Just like Muzzy did, which I very badly wanted, but could not really afford at the time. Needed Tires and tacos to go to the track...
The real selling point was another article in Motorcyclist and it was a pipe shootout with something like 23 contestants using a YZF750 test mule as a control. They measured peak HP and TQ, the overall curves of both, Db and general sound, weight, cost, and fit and finish. The Sudco (Hindle) was placing 1, 2, or 3 in each of the tests and ran just about even with the Muzzy performance wise, and it was damn near the lightest (Ti pipes weren't compared since they cost as much as an entire used sportbike back then).
For the price vs. the Muzzy I got the Sudco badged Hindle, plus a "free" jet kit and ignition advancer. It's nice that today I have been lucky enough to have both, plus a couple Ti Muzzys too. Time can be good.
But yeah, a great 7 pipe and I think you'll like it once you've ridden some miles on it.