One of the blades , that you posted sent chills down my spine.
It is hanging below the second hack saw on the right.
That and several larger ones with a handle on both ends,
kept my twin brother and I, very busy in our younger days.
Very nice collection by the way.
Nothing like a good saw that cuts correctly and fast, instead of one that
is hard to start and jumps all over the place or "Walks", while working.
Oh;
and double blade axes.
Been there done that a lot when my father thought that I old enough.
I guess, those were happy times ?