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In my reading the "big Boom" in multiblade's from a "world wide" perspective came from the Crystal Palace exhibition at the "Worlds Fair" in London in the mid 1800's where the Sheffield firms displayed some of the most exquisite knives ever made according to many modern knife historians of today.
They were made before then, but this very significant event which corresponded to a period when transportation across the world and world trade became more common place than in the past put them in a world wide perspective..
I wonder if there has ever been any production figures printed on the heyday of Sheffield? Like it was published that Victorinox makes 35 million knives a year. I wonder how many G. Wostenholm or Rodgers made in any given year in the mid-1800's?
.. In flipping through a reprint of the 1885 Wostenholm catalogue, there are categories creatively named 1, 2, 3 & 4 blade knives although the variety with these includes most of the patterns we know today..