his is a sale for a vintage British military, brass button polishing guide. These brass items were standard issue to British servicemen for many years during the 20th century. They were used to clean and polish brass buttons and other brass items on the uniform, and personal kit  in order to maintain standards.  The patent No. ends in / 17, possibly indicating a 1917 ( World War 1 ) date of issue. As the pictures show, it`s in excellent, unmarked, good condition