over the years I have only ever seen one maybe two royal mariners with solid brass bezels, this out of hundreds I have serviced and checked in the last 40 years, the bezel is zinc casting brass plated, the case is thin brass and the backs are steel, you would think for the money they charge for these things you would get a solid brass bezel.
none of the plating shops around here will touch them, so the only way I found is to clean the bezel smooth and gold paint it, I just got one in for a service, that I did a service on 20years ago, the paint on the bezel still looks fine.
I clean the bezel, use a primer undercoat, then a metallic paint like rub n buff, this type of paint can be lightly rubbed after it has dried and will take on a soft metallic shine, you can use a combination of oxidised gold and a brighter gold or brass to give an aged look, what I really don't like is the cheap pale gold sprays, makes it look really cheap, be better to paint the case black in that case
