1900 US Test Holster question

[cirelaw]

Common sence, where did they come from? Why are they basically all the same? Somebody had to invent the first one. Why are they all basically the same much like a 'church key' Whats the rarest. Did the one that came with the 1900 test luger have a 'flaming bomb'? It is so perfectly engineered! Most have no idea hoe many purposes it has other than opening beer cans with no nails!!On the mean time, Il settle on my Kreeegy !