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I got one at a yard sale about three years ago. Very late in the day. My wife wanted to stop at a yard sale because her friend lived there. So while she's talking I walked over to another yard...

That's how it's produced. There isn't much information on the Mark I on the net but there are plenty of photos, mostly of current production versions. Yours has the look to be an original WWII...

It's a Mark 1 as opposed to the Mark 2 which is the one most commonly associated with the name.