Galvanising protects steel or iron from rust. The process involves dipping iron or steel in zinc. Dials are usually made of brass, silver and rarely in more expensive watches, gold plated or gold (which does not rust). Galvanising leaves a silverish tint, not black. Additionally that dial shows what looks like a blob of paint ...
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It is definitely not galvanised or anodized come to that (only used on ally) ....
Sorry to be so skeptic about it but it does not convince me in any way. The very least I would expect from a redial, is centering !
Apart from all of that, you seem to be convinced and I admire your persistence. However, in my eyes it is mutton dressed as lamb (old english saying).
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