1c Green, Vertical Pair, Imperforate Horizontally (424c).
Vertical strip of three, top stamp light diagonal creases, bottom pair natural internal creases, (in our opinion these are just natural gum wrinkles or creases), Fine appearance for this very scarce perforation error, with 1970 and 2009 P.F. certificates, Scott Retail as one and one-half pairs
Image Magnifier / Download
Power Search for Comparables