Digging very, very deep into memory, these are all I could come up with further...(beyond what has been offered previously above)
Alessi? GraphTech? Robson? Waverly? Wilkinson? Golden Age? Kluson? Sperzel? Schertler? Mighty Mite? Strukture?
beyond these, I'd have to go off searching online like via Google, and methinks that would be cheating...so if it aint one of these, you got me stumped.
Maybe it's a custom one-off design if KoAloha has their own metal shop to fabricate such parts from brass and die-cast billets, and have re-purposed one of their spray booths for doing a baked-on, gloss-over-powder-coat of the black chrome paint...but this all seems like lots of labor and cost for a one-shot deal unless they are offering these tuners as regular inventory and as an upgrade option, where they can do them in batches, otherwise it's likely not cost effective to fabricate them in sets, one at a time for each uke.