Last three shots:
The cylinder is marked XR0526
The first thing I wondered is if this is one of the water cooled TR cylinders Muzza owned? Suzuki brought out the water cooled cylinders in 1973 and revised them slightly for '74 and again for '75. I'd guess these are first year cylinders based on the 26 but it's just a guess on my part. Anyone know for sure?
The cylinder also has 83B43 engraved in it and I wish I knew what this meant.
There was something written on the side in marker but it's so faded I can't read it. Plus it could have been added any time in the 35 plus years in between...