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postage
1922, Dec
1922f issue unwmk imperf
1922, Dec
1922g issue p.
14x14.5
1923 1923 dated issue p.
14.5x15
1924 1924 litho perf issue
1924, Jan
1924 issue worker (6 stamps)
1925 1925 issue worker wmk.
Greek border & rosettes p.
12 (6 stamps)
1929, Aug
1929 issue unwmk p.
12x12.5
1987, Mar 20
10th Bulgarian Trade Unions Congress issue p.
13
1950, Apr 26
Labor Day 60th issue p.
9-14.5
1923 ovpted on stamps of
Russia
1951, May 1
May Day 1951 issue wmk.
stars (Cuba) (no perf info)
1953, Dec
1953c issue typo print (no wmk info)
1955, May 26
Labor-Management Congress issue unwmk p.
11
1979, May 1
Five-Year Plan issue
1 to 35 of 35