​While the note itself does not display a printed date on its face, it belongs to a series often referred to as the 1963 Series. Here are the key details regarding its "year":

​Design/Printing Year: Most numismatic (currency) catalogs identify this as a 1963 issue. It was printed in China for the NLF during the early 1960s.

​Historical Context: Although printed around 1963, many of these notes were not officially released into circulation until 1975, following the Fall of Saigon and the unification of Vietnam.

​Identification: The text on the front reads Ủy Ban Trung Ương Mặt Trận Dân Tộc Giải Phóng Miền Nam Việt Nam (Central Committee of the National Liberation Front of South Vietnam). The note is distinguished by the large five-pointed star in the center.

​Summary: Most collectors and databases will classify this as a 1963 note, though some newer research and specialized catalogs occasionally attribute this specific 50 Xu design to 1968.