Silver Argent paint/ Rough Finish

I'm restoring a 69 Valiant taillights that have the rough finish on the bezel around the lense that looks like it was sandblasted and then painted silver argent in color. My question is how did they make the rough finish, it appears to be flaking on the old bezel so I think it was sprayed. These are original bezels that have not been touch. How do you match the finish. Not the color. Thanks
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