How do I read my Epiphone serial number?

The first digit is the last digit of the production year, the following four digits are the serial number. Five digits no space after the first digit were used from 1951 to 1956 and from 1961 to 1967 for both acoustic and electric models.

What is a peghead on a guitar?

A headstock or peghead is part of a guitar or similar stringed instruments such as a lute, mandolin, banjo, ukulele and others of the lute lineage. Machine heads on the headstock are commonly used to tune the instrument by adjusting the tension of strings and, consequentially, the pitch of sound they produce.