Steve, who kindly provided the pics of the filter yesterday, sent over some photos of his Tiger 100 Green Laner (Trail Bike) that is still getting regularly used and abused on the tracks and trails across the Pennines in the north of England. Having been up that way on off road excursions quite a few times I can promise you it's an unforgiving place for any bike.
If you're having problems identifying the running gear, it's hardly surprising. The front section is rigid Triumph with an after market McCandless swinging arm conversion grafted on! New to me as well, obviously not just Featherbed frames that they kept themselves busy with then.
Steve reckons it's an old shitter that he doesn't like cleaning.................looks great from here!