Here are three more: On the left, a "fixed" example with no pivot joints; the blade is flat and without decoration on the opposite side. In the middle, the blade may be retracted against the neck. On the right an example with two pivot joints. I have always regarded the two on the right as being of the second half of the 20th century. The one on the left might be a bit earlier, but I suspect the "white" metal of the decoration to be aluminum.
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