Hi Bill,
(Sorry it took me a while to reply - I somehow missed your question)
I re-chromed the original plate, and YES, the plater did it with the original enamel in place. It was not cracked and it remained in good shape through the plating process which involves some nasty chemicals & processes. I do not know the specific technique he used, He told me very confidently that he'd done similar things before and said he'd take care of it... He did.
The enamel on C-155's plate has not been renewed apart form a nice polishing...
- I magine that if you were producing a new one, you'd plate the new bronze plaque and THEN add the enamel... But I've never done anything like this so I am only speculating.
BEN: Beautiful plate you have there - nice work! (pretty number font too!)
Note: I seem to always refer to plaring as 'Chroming'; as a generic term simply out of habit. - As far as I understand, and to be clear technically, I should say that I believe that all my metals have been in fact Nickel-plated.