During World War II, RAF Crews Had Compasses Concealed as Uniform Buttons...
WW2 RAF uniform buttons that become a compass fo... ...utton is actually a compass. During World War II, Royal Air Force crews were often equipped with these buttons in t...
https://www.neatorama.com/2022/07/30/During-World-War-II-RAF-Crews-Had-Compasses-Concealed-as-Uniform-Buttons/
