Epcor was a short-lived brand from Bakersfield, California. Epcor instruments were made by Hallmark during Joe Hall's tenure. The Epcor line was conceived in 1967 by Ed Preager, a manufacturer’s rep from Beverly Hills, who wanted to create a line of budget hollow body six-string guitars, 12-strings, and basses. Epcor guitars had laminated hollow bodies made in Italy with either red or three-tone sunburst finish and f-shaped sound holes. Necks and pickups were made by Hallmark. The Epcor headstock top was shaped like a letter "E" (like the Mosrite "M") and they had bolt-on maple necks with rosewood fretboards. Around 30 Epcor instruments were made before the arrangement fell through for financial reasons. According to Bob Shade (owner of Hallmark circa 2012) about 35 instruments exist today.

Source: Vintage Guitar Magazine - Bakersfield basses (July 2012)