The new currency that went into effet in late 1966 was overprinted on the International Cooperation Year set on 14 January 1967.
Most collector of the Dubai issues try to purchase the entire set in complete miniature sheets. Each of the sheets contains ten stamps, which consist of five tete-beche pairs of two different stamps. The only sheet that contains two different stamps in different colors (The Dubai ruler and President Kennedy), is also slighter taller than the other three sheets.
The sheets are becoming quite expensive, especially mint, as many were broken up into the respective sets. They also exist CTO'd, witch are difficult to find in complete sheets.