Hi everyone. Just bought a HAMILTON Neil Grade 747 with a mat black dial, 18K arabic numerals 1-12. All back dials I have seen so far wer shiny and lacquered, this one is not. The surface has a look of very fine sand, the sub-second area almost looks like it has a circular sand-pattern. If this is a re-done dial (usually I can tell the difference), it was a remarkable job. who can help please?

Thanks/Chris.