1930's through 1950's Vintage Waltco SAF-T-SHEATH Hunting & Fishing Knife Balisong Butterfly Knife.
There are basically two models over the time frame.
You can see the early desing in Popular Science Nov 1949 Ad & A Comic Book Ad.
I have the Original Boxes in the photos so you can see that the actual box had these on them.
There is much speculation on these but all these are Waltco models just produced in different decades.
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