I saw this today, from NKG, they've got a list of minis they're looking for.
RAL20-808 Pegasus Lt. Hover Tank (Blue Card)
RAL20-808O Pegasus Lt. Hover Tank (Orange Card)
RAL20-750 Rommel/Patton
RAL20-750B Rommel/Patton
As you can see, the first 2, it says Blue Card/Orange Card, and the 2nd has the "O" after the SN, so you'd think it means "Orange Card", though I don't know that RP ever actually labeled it that way. But then the 2 Rommel/Pattons Tanks, neither indicates what color the Card is, while the 2nd has a "B" after the SN. You'd think that, if "O" equals Orange, then "B" equals Blue, right?
They do the same with several others, both 'Mechs and Vehicles. Seems like, when they do have ("Color" Card) indicated, the letter matches the color. (B=Blue, O=Orange) Then you've got the Schrek.
RAL20-753 Schrek 80 Ton PPC Carrier
RAL20-753 Schrek 80 Ton PPC Carrier (Blue Card)
Several also have BC for "Blue Card", then you've got some other oddballs.
RAL20-610-P Blackhawk Omnimech
RAL20-610-BC Blackhawk Omnimech (Blue Card)
RAL20-632-CLA Clan Predator
RAL20-864-R Hatchetman Mech
RAL20-645 Marauder IIC (Unseen)
RAL20-645-MAR Marauder IIC (Unseen) (Blue Card)
AL20-629-PHA Phantom Omnimech
RAL20-632-REA Reaper
RAL20-840 WHM-6R Warhammer
RAL20-840-86 WHM-6R Warhammer (Black & Orange Card)
RAL20-840B WHM-6R Warhammer (Unseen)
RAL20-784-MYR Myrmidon Medium Tank
RAL20-749-GOB Goblin Infantry Support Vehicle
Does anyone know if RP used these SNs, or at least printed them on the cards? ??? I've got several older minis, still MIB, but I haven't really paid much attention to the cards. :-\