Sakai (Teisco/Kawai style) EG4-T guitar - "Hertiecaster"

The nick-named "Hertiecaster" was predominantly sold in German musical instruments stores in the early 1970s. Plywood body, 4 single coil pickups, maple neck. A variation exists with "only" 3 pickups (rare).
Later in the 1970s, Samick in Korea copied this model, but their models don't have the German carve in the body and have painted headstocks, along with a slightly different controls layout. The most common brand seen on the black headstock is "Star 4T".
Hertie was a mall chain in Germany in the 1960s and 1970s, it is long out of business. There is no actual hard proof that these guitars were sold at Hertie. However, people nicknamed these guitars "Hertiecaster" to mock their owners.