Soviet Union 1923 Philately for Labor surcharges complete, with...

Soviet Union 1923 Philately for Labor surcharges complete, with additional paper variety of 250r, including 1r+1r bronze and gold, 4r+4r bronze and silver, all tied by 1 May 1923 Moscow First Day cancels on registered cover addressed to Czechoslovakia, v.f. and rare cover, franked with the complete set, with 1988 Mikulski certificate

(via Philasearch.com - Soviet Union, Scott B38-42)

http://ift.tt/2oAJWqt