Watch List notes:

Saudi Arabian Monetary Agency, a heavily engraved partial die proof for the reverse of a 100 riyals, ND (ca 1961), red and white, the minarets of the Holy Mosque in Medina at left and right, arms at centre(Pick 10 for type, TBB B109 for type), PCGS Currency 53PPQ About New. Unusual and extremely rare.

Estimate: £400 - £600