Board Thread:Questions and Answers/@comment-13003739-20130106202152/@comment-302495-20130107225221

Jelly Bubble wrote: Shurow wrote: Sir Jjoeyxx wrote: I would classify all items that haven't returned since October 2009 as rare. Like the Pumpkin Antennae, or the Firework Rocket Pin

On this wiki, it has been established not all 2009 items are rare. Items released in October 2009, will be rare in October 2013. So you're saying it takes 4 years for an item to become rare (If it is not released again)?

Yep!