The only rare one is the red MV. The red MM is scarce but not real valuable. The blue ones that start with W are a little tougher to find but do not command much of a premium.
Some info ND (1942-1945) HC $ 1.50 21% Red and blue combined 5,000,000,000 ND (1942-1945) HT 20% ND (1942-1945) MM 7% ND (1942-1945) MV 0.5% ND (1942-1945) TH 14% ND (1942-1945) TY 16% ND (1942-1945) UC 17% ND (1942-1945) UH 15% ND (1942-1945) UT 14% ND (1942-1945) UV $ 0.24 11% ND (1942-1945) UX $ 0.24 20% ND (1942-1945) UY 17% ND (1942-1945) VC 18% ND (1942-1945) VH 20% ND (1942-1945) VT 17% ND (1942-1945) VU 20% ND (1942-1945) VX 14% ND (1942-1945) VY 12% ND (1942-1945) XC 11% ND (1942-1945) XH 15% ND (1942-1945) XT $ 0.25 18% ND (1942-1945) XU 17% ND (1942-1945) XV 15% ND (1942-1945) XY 17% ND (1942-1945) YC 13% ND (1942-1945) YH 17% ND (1942-1945) YT 20% ND (1942-1945) YU 18% ND (1942-1945) YV $ 0.27 15% ND (1942-1945) YX 15%