Why are some century / aristocrat plugs brown and others are black?

[Fin Crowe]

This is a really weird question, but yeah. I was cleaning my two extra aristocrat bases today, and i noticed that they each had a different color plug / cord (one being black, and the other being brown). I just wanted to see if any of y'all had an answer.

[CrunchyCanadian]

In my experience most of the oldest model late 60s Centuries had white cords. Most 70s lamps have brown cords then later versions black. This is by no means a hard and fast rule as there are exceptions. 32 oz lamps are a different story (for example, the 90s Elec-trick series had white cords). 

[Fin Crowe]

Huh, I kinda figured it was something like that. Im so used to most AC cords being black now days, I didnt know if it had something to do with the voltage or similar stuff, although i guess it wouldnt really make sense for two of the same bases to operate with different electrical needs, lol.

CrunchyCanadian said:

In my experience most of the oldest model late 60s Centuries had white cords. Most 70s lamps have brown cords then later versions black. This is by no means a hard and fast rule as there are exceptions. 32 oz lamps are a different story (for example, the 90s Elec-trick series had white cords).