JEDSON was a brand of John E. Dallas and Sons of London. In the 1920s, Dallas instruments were being mass produced under this brand name which derives from Dallas' initials, "J.E.D", and "Sons". The brand was still being used in the early 1970s, a few years after the Dallas Musical subsiduary had merged with Arbiter Electronics to form Dallas Arbiter.

The late 1960s and early 1970s Jedson guitars were Japanese made. Manufacture of the Jedson instruments stopped around 1975.

Link: Jedson Information site.