The complete set in detail
CBIT53
3O53
1938 : Bureau international du Travail - 20 c. red and buff with circular overprint "S.d.N. Bureau international du Travail"
CBIT54
3O54
1938 : Palais des Nations - 30 c. blue and blue clair with circular overprint "S.d.N. Bureau international du Travail"
CBIT55
3O55
1938 : Palais des Nations - 60 c. brown and buff with circular overprint "S.d.N. Bureau international du Travail"
CBIT56
3O56
1938 : Bureau international du Travail - 1 F. noir and buff with circular overprint "S.d.N. Bureau international du Travail"
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