Is your watch not this one? https://www.steinhartwatches.de/en/ocean-one-39-black-ceramic.html
In which case it is ceramic.
Nope
Website shows the markings are engraved
Mine is not, you can see the alu numbers
1 Attachment
Oven cleaner will strip the anodising if you leave it long enough, you could try a very quick dunk then wash.
Almost looks like it’s got a clear coat on it to protect it. Doesn’t look like the bare aluminium is exposed, that might be your problem.
That looks like the ceramic bezel to me.
Got the original order email?
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Is your watch not this one?
https://www.steinhartwatches.de/en/ocean-one-39-black-ceramic.html
In which case it is ceramic.