The complete set in detail
F0236
SG 481
48th Congress of International Labor Bureau in Paris - Sower type 'background with lines' - 50 cts. red, overprinted B.I.T.
F0237
SG 482
48th Congress of International Labor Bureau in Paris - Sower type 'background with lines' - 1.50 cts. blue, overprinted B.I.T.