Don't think it was a customization or option when it was new. The original serrated bezels on these were solid 14K white gold. It could be that the bezel was melted down for gold value and a steel version was made to take its place.
I don't know if the bezels on these were interchangeable with the date-only version (which I think also had steel, not gold, bezels).
At one time, Ofrei.com was selling replacement steel bezels for this case. However, I don't remember if they had plain versions.
Hope this helps,
gatorcpa
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