Originally Posted by jimc101

Unless the fork as had all the decals removed, all MTB forks on the market have their brand, and model prominently displayed, Does it have them?

From the picture, it's a Marzocchi fork, which would indicate it's from 2004-2009 going by Bikepedia, although each year of the Vertex 30 used a different fork model.

As it's a bomber chassis fork, unless you want to pull it a part (and that's not hard), just get some silicone spray, and spray the seals to see it that stops the squeak.