I recently came into a very nice B66 Champion Standard, and I'm curious what you guys know about these. Do you have any thoughts on their typical applications (touring?), and whether they came standard on any English bikes during their time of manufacture?

This one is stamped D65 under the backplate, which I understand dates it to sometime in the latter half of 1965. The underside of the saddle has also been branded with the letters F V G in a column, top to bottom, and an H forming a row with a V (see picture).

The saddle appears to be made of a thicker leather than most, it's nearly spot on 5mm measured around the edges with a set of dial calipers. The edge also seems to have been treated with something that looks like black paint. It does not have the appearance of ordinary saddle dressing.

What say you?