The stuff of Mons and the Christmas truce……
A pre WW1 regular army issued trench (or as was then signal) whistle.
A Hudson made ‘flute’ whistle, carrying the early full maker address (see images), good clear 1913 date and with a WD broad arrow.
Excellent overall condition with only minor denting and surface scratching.
A hard to now find whistle, being all the rarer with the WD mark. (Most WW1 whistles of this type are not WD marked, contrary to popular belief).