Here’s a picture of a National metal acoustic guitar. They used steel or nickel plated brass. Looking at this picture, can anyone tell how the designs would likely have been etched. I’m guessing acid.
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According to Vintage guitar magazine it’s actually a negative sandblasted image made with one of a number of jigs that wear out over time (kinda like a mint striking plate for coins). However, looking at some of the models they sell today, a few of them appear to be acid etched (much darker etch pattern than the one in your photo).
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