The Bhutan UPU Headquarters Commemorative Stamp Set from 1970 features stamps with denominations ranging from 3 to 20 CH and 2.50 NU. These mint never hinged stamps showcase a colorful design in green, orange, blue, and red, representing transportation and the UPU Headquarters topic. Issued in Bhutan, the stamps reflect a decimal currency system and are ungraded and uncertified. This set is a commemorative collection celebrating a significant event or theme in Bhutan's history.