|1946-1968||I must say I am confused about Zen-on or Zenon. Some snippets as follows:
In 1954 Hayashi Gakki a guitar manufacturer was bought out by Zenon, a large music distributor. [Source: Acousticguitar.com ]
Zenon are rebranded Beltone guitars made in Japan in the 1960s. [Source: Blue Book of Electric Guitars entry for Beltone]
Later in the 60’s decade Zenon guitars were marketed under the Morales brand name. [Source: The Guitar Collection ]
Images eBay: On an acoustic Zen-on from eBay Canada: Label says = ZEN-ON Guitar, Seisachu sho, made in Japan.