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My guess would be that the spacer did not survive with all knives, and improvisation is common. A rigid leather, such as that found on a shoe sole would be good. It could also be made from heavy...

You can look this up by calling it an Italian MSVN Blackshirt Dagger, Youth Knife/Dagger, or Boot Knife. When you search, you can see asking prices north of $800, but do they sell?

My thoughts...