I have yet to find any more information about the saddle, can't find any other pics on a Google search and you are the only response so far... post a picture of yours..I've one as well. Did you find out anything about them? Shape looks late 70s pre Turbo type.
I was going to say it's a bit different to see one in blue, but then it's the only other one I've seen, do you know what bike it came off..?Photos attached.
Definitely the same same saddle except yours is in suede. This got me thinking Raleigh used a blue suede ISCA saddle on the 80's Road Ace so took a look at the German catalogue. The catalogue spec says ISCA Tornado for the Road Ace but the saddle on the Competition model looks familiar, checked the spec and its ISCA Competition..Ill take a different photo but I'm sure it's the same one.. Didnt come off a bike as far as I know. It's new - but grubby.