FS/FT Steel Shutter signed by Gentry Stein (Trade Preferred)

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This is actually the hardcoat anodizing, not nickel plated.

I have the same one and could not recall the details of it.
Answer from David at OneDrop last year in response to the picture of mine I sent:

"That looks like the hardcoat anodizing we did on those. Very cool
finish and one we didn’t do very often at all.

Cheers,
David"

Here is an example of a Nickel Coated Kuntosh for comparison:

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