Looking at the way the material in the bezel is sitting, I'd take a punt on it being some sort of filler/polymer rather than the original bezel insert... thinking some sort of coloured modelling clay from the way it sits in between the metal bevels of the bezel itself.
Am I right in my understanding that the bezel inserts are NLA for these?
Could explain why someone got creative.
If the price were right, I'd be tempted to pick it up, have the case regrained, and run it with no bezel...
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