100 M dark violet, 300 M medium blue postage stamp issue of 1923 on a registered letter from Krolewska Huta (formerly Koenigshuette, current name: Chorzow) to Frankfurt, with postmark ZKr KROLEWSKA-HUTA 25. 4. 1923 a, arrival postmark ZKr FRANKFURT (MAIN) 27. 5. 1923 rs, note also the provisional registered stamp, good condition.