Two consecutive $10 1950 Federal Reserve Notes in Gem CU Uncirculated condition, G-B block with NARROW/WIDE BACK DESIGN VARIETY CHANGEOVERS as seen in the last photo.  Federal Reserve Bank of Chicago, G7.  According to the Schwartz/Lindquist reference this is a New High Serial Number for the Narrow Variety.  Beautiful notes with razor sharp edges, corners, white paper and vivid inks with gem centering.  Pictures show exactly what you are getting.

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