In 1969, Norlin Corporation (ECL) controlled the Epiphone name. No plant is on record for that year.[1, 2, 3]
A Epiphone guitar from 1969 belongs to whichever era was running on its product line that year. An era is a stretch when the company that controlled the name and the plant that built the line both stayed the same. If you know the line, the table below tells you which version of Epiphone you have. The name dates from 1904[S355], 65 years before.
Every numbered marker on this page points here: the document, its grade and the passages relied on. An era is computed, so it cites the facts it was derived from. A fact marked “no source” has no claim attached yet.