In 1977, BOSS launched the iconic compact series with the OD-1 Overdrive, PH-1 Phaser, and SP-1 Spectrum pedals.
In the 40 years since that introduction, the colorful line has been adopted by generations of musicians, with 119 unique pedal models produced to date and well over 15 million units sold.
Most pots (potentiometers) on guitar pedals and guitars subscribe to the Electronic Industry Alliance (EIA). A pot is basically the component that controls volume and tone on your guitar or guitar pedal. Pot codes give you the build date of the pot only not the pedal or guitar.
Therefore the code on the pot can be dated as long as the company producing the part was in the EIA. So guitar pedal dating by pots is basically used to get a roundabout date for your equipment.
In more recent times, Boss expanded their product line by including Digital Studios, rhythm machines and other electronic music equipment.The earliest Boss product was called B-100 The Boss, released in 1974.This came with a clip-on pre-amp and a pickup to amplify acoustic guitars.But, they can also be approximately dated by pot codes.Guitar pedals and some guitars can be dated by their pots.