Arab Republic of Yemen, Yemen Currency Board, obverse die proofs for 50 Rials (2), ND (1971), no signatures or serial numbers, one stage with borders and values, black and white, other stage with detailing, dark grey-green (as issued), ink and pencil annotations on face, good extremely fine to about uncirculated and very rare (2 notes)
TBB B110p, Pick 10p £120-£160