50 H. Blackish ultramarine with overprint in type I (dark rose) and 50 H. Vivid magenta with overprint in type I (dark bluish purple), tied by rarer not first day postmark" X Karlovy Vary 1 X / - 1. X. 38" on letter piece, faultless condition, issued only 214 sets - with first day postmark especially rare, expertise Brunel VP (2020) : "the condition is perfect. ", Michel 1.000.-