HOLD ON THERE!!!
Mason ID'd the chip as being a "1993 MGM $25 5th Anniversary". While the MGM opened (at that location) in 1993 (and the date appears on the chip) the chip was released in 1998 for the 5th Anniversary as a Limited Edition chip.
The Campiglia/Wells (Official) guide (3rd Edition) does not list Limited Edition chips (with very few exceptions, this NOT being one of them). While there is a reference in the C/W guide for two $25 chips as a primary and backup 1st issue chip (in 1993) I can see where the date given in this post could be extrapolated to be the date of the release, even though it still says 5th Anniversary. (Those two $25's are valued at $75 and $1,000, respectively.)
The Chip Rack (TCR) on the other hand, does list Limited Edition chips and this $25 5th Anniversary chip is listed as TCR #V4926 and carries a value of "H" ($30 - $39) in new condition.
Mason, I regret to have to inform you that in used condition, it is worth about $25 - $29.

Sorry Jeremy.
This is what the chip looks like. The white specks on the blue inserts are a light reflections of the scanner off the aluminum flecks in the insert. The body of the chip (green) and the yellow inserts do not have aluminum specks, only the blue inserts.
Jim (Gaming Ore) Follis.