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They make a really big deal of it if they use a ceramic bezel, as they did on the updated Marinemaster 300 line. They have never stated anywhere that those SPBs have a ceramic bezel. It’s a really nice bezel - I’m certain it’s the same as what they use on the SLA017/037/etc - but eg they state the ceramic bezel here for the SLA023:
https://www.seikowatches.com/uk-en/products/prospex/sla023j1
And not for others.
I'm not so sure. Do you have a source for this?
I know marinemaster watches have inlays that are enamelled and polished alu but I thought this particular watch was full ceramic.