I expect this has been done before but I'm a new bug so here goes. What cap badges are still in service today that were used in WW1 WW2 and what is the oldest cap badge still going. My definition is that if you got hold of an old cap badge you could wear it now, provided you are in the right regiment/corps. (Accepting of course that you are not forced to wear an issue staybright job). I would also accept interesting side discussions on other butttons badges and regimentalia are still going. For what its worth I offer the Cap Badge of the London Scottish which was introduced in 1908 and is unchaged since then. Purists may argue that it was surplanted by the crusified moose of 51 HIGHLAND between 1967 and 1992 and so does not count, but it continued as the badge of the Pipe Band and Cadets before being reintroduced in 1992 and I wore it illegaly while on attachment to the Royal hong Kong Regiment (The Volunteers) 1983 - 1985. The London Scottish also has the oldest collar dogs - becasue they invented them. The collar dogs introduced in 1859 are the same as those used today on No 1 Dress.