The complete set in detail
CBIT49
3O49
1938 : Bureau international du Travail - 20 c. red and buff with overprint "S.d.N. Bureau international du Travail"
CBIT50
3O50
1938 : Palais des Nations - 30 c. blue and blue clair with overprint "S.d.N. Bureau international du Travail"
CBIT51
3O51
1938 : Palais des Nations - 60 c. brown and buff with overprint "S.d.N. Bureau international du Travail"
CBIT52
3O52
1938 : Bureau international du Travail - 1 F. noir and buff with overprint "S.d.N. Bureau international du Travail"
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