This is a block of 4 mint, never hinged Postage Stamps from China in 1991 numbered J180.
These stamps feature 13th Conference Int'l Union Quatenary Reserch.
The block measures 3" long by 2.5" wide and is fault free.
This mint never hinged block is in excellent condition. It has full, undisturbed original gum with no perforation separations.