Looking for a 1680 Bezel

[FormerBuckeye]

I inherited a 1680 Red Sub, circa 1970, that was purchased new by my late brother, a U.S. Merchant Marine officer, who wore it daily for over 20 years. It is now my privilege to wear this timepiece daily and eventually pass it on to our heirs. However, it is missing it's bezel (my fault - swatting a bee out of the car). My local Rolex jeweler sent it to Rolex and they returned it saying parts are not available. Can anyone recommend a good source for a new-old-stock or quality used replacement?

Thanks!