My best estimate is satin. Definitely not gloss.
Probably baked on, modern paint stripper doesn't soften it.
All the cases I have stripped there had been zinc plate underneath so be cautious if using alkyd resin paint.
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On the left OEM finish, simoniz tough black satin on the right.
I used an epoxy primer as the first coat as a barrier to keep the zinc away from the top coat. Only time will tell how durable this will be.
Regards
Dave