Here is a vintage ruler. The rule is a boxwood ruler (picture 3). The ruler is made in England. For my best knowledge, I estimate this rule was made in 1960s.The ruler has metrics convert function (picture 3, 4, 5).

The rule's condition is still good. The mechanical system is still working properly (picture 4, 5). The ruler total length is 12 inches (picture 5).

Happy to buy the ruler!!