100 M dark gray violet, 300 M medium blue postage stamps issue 1923 on registered letter from Krolewska Huta (vorm. Koenigshuette, in today's name: Chorzow) to Frankfurt on M., ZKr KROLEWSKA-HUTA 25.4.1923 a, arrival postmark ZKr FRANKFURT (MAIN) 27.5.1923 at back, you would note also the provisionally registered cancel, good condition