The saddle was one of the few parts that needed to be replaced. I don't think it was original anyway, plus I was worried I'd ruin my britches if I sat on it. I replaced it with an AGDA.
I believe the bike originally came with either an AGDA or an Ideale #43.
Mine says "NOREX" and some other stuff that is illegible.
One thing to watch is how the seat clamp sits on the seat post. The seat post is straight so the clamp can slide down if it isn't tight. This ends up with the post pushing a bump upwards in the middle of the saddle, not good for prostate and other key elements of one's anatomy. A good upgrade is a real seat post, which means taking out that metal collar that fits into the ST and finding or making a French-size post.