Went down to PING to have them to take a look at the shafts and the rep stated that on some of the older stock of shafts they used stickers and on the last 3 irons in my set they just happened to not print the silk screen black letters. All of the shafts say "true temper" on them but the last 3 irons PING and ZZ65 happened to not be printed on them, no big deal.
Went down and hit these the other day, they feel different and will probably take some getting used to due the clubs being at a different lie angle than my old Dunlop clubs and just a different feel overall. Was hitting alot of these shots off the hosel area. Really excited to start swinging these well though.