The Gibson UB4 Banjo Ukulele was built in Kalamazoo, Michigan from 1927 to 1935, and again in 1938. Gibson was relatively slow to the Ukulele market, but had been building banjos since at least 1918. The UB-4 is a professional grade instrument, with full flange and resonator. Gibson also offered the UB-5, which was this same instrument but with gold plated metal parts. This trim level would put it in the Mastertone range, but these Ukuleles don’t have the Mastertone tone ring.
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