Comparison of tritium night sights.
From left to Right:
Trijicons from 9/2001
Trijicons from 8/2009 (new)
MMC/PT night sights (Race Cut, formerly IMX) from 8/2009 (new) (set #1)
MMC/PT night sights (Race Cut, formerly IMX) from 8/2009 (new) (set #2)
Meprolights from 8/2009 (new)
Meprolights from 6/1997

Note: The MMC/PT night sights were warranty replacement "new" sets replacing ones purchased in 5/2001.