1983 to 2009 New Era Hat Tagging Primer

[Roady]

What about this Mark Teixeira signed hat?
The MLB hologram # is BB063593 and is listed as a signed cap from Texas Rangers signing on May 29, 2006.
The hat clearly looks game worn. It is 100% wool.

New Era 50th anniversary was in 2004.

I figured it could be a 2005 hat and New Era sent some old stock to Texas in 2005. I would not think it would be sent 2 years later in 2006 but who knows.

Or could this be a hat from 2004 and Teixeira just cleaned out his locker for the signing?

Any ideas?