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There are many 75 Customs and Deluxes with maple neck from Kalamazoo, most with 5xxxxx serial number. I have had some such Customs -
they even had bigger frets, not older fretless wonder frets.
My 3d to the last number is 8. Also, the serial number is stamped into the wood, begins with 00, and there is no Made In USA, only the serial number. So it's most likely a Nashville?
All the K'zoo '74s and '75s I've seen had the Made in USA stamp. None of the K'zoo '74s and '75s I've seen have had maple necks. Just my experience, my eyes.