Essential Once. Leica/Lumix Macro-Elmarit 45mm

A couple of days ago, fellow Blipper, Notquitenormal, posted an image of an old pocket knife.  It jogged my memory.  Sitting in a drawer of my tool bench is an almost exact twin to this knife.  It was part of a collection of old tools which had belonged to my dad.  Tonight, I took it out, and, with a magnifying glass, found the manufacturer's stamp:  E.Blyde & Co Sheffield.  Then I sent the Macro-Elmarit to record the knife, and its stamp.  An online search revealed that this was a British Army-issue jackknife.  There is one sturdy blade, - looking as if it was given a quick sharpen on a handy curbstone -, a can opener, and a vicious-looking spike.  Previously when I'd looked at the old knife, I'd thought that this  must be a sail maker's tool.  But now, I'm thinking the spike could be used to dig stones out of a horse's hooves, or perhaps dispatching an enemy soldier in an emergency...  The stamp has the British Army "Crow Foot" insignia, and also the year, 1942.  See the Extra.  My dad was in the Royal Army Medical Corps during WW2.  See here for more.  It all makes sense.