Number 600

"Who keeps the metric system down? We do!"

- Number 600's unlock message.

Number 600 is a costume for Skinner which was released during the Stonecutters 2014 Event.

He returned for free on Feb. 7, 2015 as part of the Stonecutters Black Market Sale.

He returned during The Buck Stops Here 2018 Event for free in the store.

He returned on January 9, 2019 during the Not Yet Spring Cleaning 2019 Event.

Trivia

 * From Season 6, Episode 12 “Homer the Great”.