I bought this Vetta SL with manganese rails from a take-off bin, probably for about $15, sometime in the 1990s. I just dug it out to do some A-B testing on my mountain bike. It's nice and wide (160mm) and pretty flexible. I don't think it's a leather covering though. Vinyl?
Given the insane prices of saddles these days, I may throw it on eBay if my bum isn't satisfied.