Sg 213 1900 ½d Blue green Jubilee block of 18 with rare vertical comb side perforation. If its quality you're after.... We are members of the PTS and attend Stampex (Stand 43). The item "1/2d Green Jubilee block of 18 with rare vertical comb side perfs UNMOUNTED MINT" is in sale since Thursday, August 26, 2010. This item is in the category "Stamps\Great Britain\Victoria\Surface-Printed Issues".The seller is "mintgbstamps" and is located in Northampton. This item can be shipped worldwide.