60 H. Stefanik with dark green-blue hand stamp overprint "Karlovy Vary 1. X. 1938 plus swastika", actual should the overprint on this stamp in bright blue green result - it is a scarce colour error originated through amalgamation the endorsing ink near the change the overprint colour, in conjunction with number 6, 7 and 9 on blanko-envelope cancelled "Karlovy Vary 1 4. X. 38 4 d", expertise Robert Brunel VP (2019) "the condition is perfect. ", Michel 1.400.- Euro for single used