"This vintage New York City subway roll includes stops along the "D", "DD", "E" and "F" lines with both 6th avenue and 8th Avenue Express and Local mentioned. This roll is c.1967 - at this time certain routes on this particular group of signs were altered. Stitching between panels was professionally done to correct sections that were printed upside-down for simultaneous visibility inside and outside the subway car." $300 @ economica.Etsy.com
A DD line? Madness.