It's probably polished 1095 steel. It's actually about the closest thing you'll find to plain carbon steel if that's what it is. Hard carbon steel takes a great polish if you want to give it a polish. There should be set on a dovetail saw, just a minimal amount. I'd imagine that your saw was set and either clamped (to reduce the set) or stoned to reduce the set.
You don't want it to have no set at all or it will bind in thicker pins and tails.
Unleaded tastes a little tangy, supreme is kinda sour, and diesel tastes pretty good.