I am sure it can be added back into your registry set if you ask politely minus the red designation of course.
From NGC: There seems to be some confusion as to exactly what constitutes a variety. In United States numismatics, a variety may be defined as a die or die pairing that offers some distinctive feature not a normal part of the design. For early U. S. coins, those made before the introduction of the reducing lathe in 1836, every die required extensive hand punching of letters, numerals and other small features. Therefore, each and every die was distinctive, and each die pairing constitutes a variety. Thus, all coins from this period are of some identifiable variety, and each die pairing may be identified by number under NGC's VarietyPlus service.
NGC utilizes numerous other designations that do not, however, constitute varieties. These include designations such as FH for Full Head, FT for Full Torch and FBL for Full Bell Lines.Likewise, the designations BN, RB and RD for Brown, Red-Brown and Red, respectively, are not varieties.
I expect that this includes world coins as well.