It won't say Stihl on it. It's still OEM.
The ones that said "Stihl" on them (on some models) were a lower quality casting that was actually made by Stihl at one point. As Dave said, the OEM Stihl jugs were made by Mahle (what you have there), Kolbënschmidt (KS-looks more like a $ sign on a jug), Gillardoni and Stihl themselves. I have a KS 026 cylinder that says "Stihl" and has the KS marking.
I don't understand this hole misalignment you speak of. All 4 base bolts should be accessible through the holes through the fins.
You need to look inside the jug. See if it's still usable. Randy (Mastermind) has a good video in the sticky section here and on the other forum of how to clean a jug up. The Aluminum transfer is soft stuff and the nikasil is tprather tough and hard. Removing the transfer usually involves using some muriatic acid, which can be dangerous but will dissolve aluminum, or sanding the soft aluminum off if the nikasil.
There's a very good chance that your cylinder is salvageable.
You do need to find out why your saw scored in the first place though. If you don't, you'll be back in the same situation after a lot of time and money.