The second stamp in the Taegeuk series is the 10 poon. The stamp is designated Scott #7 deep blue (both printings), KPSC #4 (1st printing; #4a 2nd printing and Minkus #4. Black and white images and data are from Brady-Tyler, Zirkel, G. La Francesca and colour images and data are from MikeG Canada (Stampboards), Florian Eichhorn, David Phillips, KSS, Robert Finder and other sources.
The second value in the set is the 10 poon deep blue. The first printing is identified by two plate marks that show up in most, but not all of these issues. So when looking for the printings for this value, it is best to look for one of the two identifications marks. The first of these marks is a very small dot of blue color in the top horizontal bar of the “E” in “KOREA”, and the second mark is a horizontal line separating the bottom line of the lower hankul letter. See Figure 4 for an example of a stamp with both identification marks. Scott does not distinguish between the two printings and numbers it as 7 deep blue, and values it as at $130. The KPSC has the first printing numbered 4 and valued at 500,000 won ($445) and the second printing numbered as 4a, and values it at 200,000 won ($180). (Robert Finder)