Other countries–Stamps of Slovenian interest

Kingdom of Yugoslavia

(*),54/6,Postage Due, Proofs. Album page with six proofs (three are with Veličković certificates). Two Proofs of 30 para are in blue on surfaced paper (one thinned). Three Proofs of 50 para are in black on grayish paper of differing thickness and Din.1 in black on grayish paper (brown stains).