After the first few guitars, the Explorer had a long drooping headstock with the tuners placed in a straight line on one side (referred sometimes as "banana" and "hockey-stick"). This headstock design was incorporated by Grover Jackson, founder of Jackson Guitars and other electric guitar makers such as Kramer 20 years later, giving rise to the "pointy-headstock era" of guitars. However, the very earliest Explorers made between 1957 and spring 1958 featured an unusual "split"-shaped head with the tuners placed in a standard 3+3 arrangement, carried over from the Explorer prototype (better known as the Futura).