Vintage Frosted

I have a vintage trumpet, a Gretsch Pathfinder, which seems to be shiny and matt nickel coated brass.?
The states of the bell pattern your name and Chicago / Brooklyn. It has a serial number 4 digits starting with 3. In addition to similar instruments on Ebay, I can not find any information about the speaker or the early Gretsch Company (before he entered the guitar business.) Anyone out there have any idea where I can find information?? Thank you.
I do not know much about Gretsch, but I heard a rumor that they were bought by Amati. I could not find much anything else though. Sorry …
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