This set of four stamps, listed in the “Korean Stamp Catalogue” (the North Korean catalogue), sometimes shows up on English (Ebay, Delcampe) and Korean (Kobay, Narauction) language auction websites. What is noticeable about this small set is how the set is listed for relatively high prices.
Normally North Korean stamps from the 1970s and 1980s are relatively cheap, often even very cheap. These days one can buy complete year sets for next to nothing. And this is from an era in which the DPRK printed set after set after set of stamps, all just to get hard currency.
But this set stands out, even in the official North Korean catalogue. Where other sets cost next to nothing, this one all of a sudden is listed at 80 dollars for the four stamps plus another 80 dollars for a souvenir sheet. Why? What makes this series so special that they have to be so much more expensive than the other stamps of this era?
As a side-note: one could say that these are in a way personalized stamps. If you imagine the grey frames being the standard stamp, with a space inside for your own picture, then it almost does look like someone from Germany decided to put a few photos of Berlin landmarks on North Korean stamps. Not that such a thing as personalized stamps could ever exist under current conditions inside the DPRK of course…