Those appear to be Rubner tuners.
https://www.rubnertuners.com/f-style-mandolin-new
"It's comparable to playing a cheese slicer."
--M. Stillion
"Bargain instruments are no bargains if you can't play them"
--J. Garber
Thanks a lot Mike!
If this set were all nickel I’d probably pull the trigger
I’ve had two sets of the Rubners, and very pleased with the quality, smoothness, and price.
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