old ( navaja?) folding knife

[francantolin]

Thank you Rick and Kronckew for your message,

Rick, here is the spine,
yes the engravings-deco are only on one side, it make sense when we see the entire back-spine,
nice deco too with the nails making a floral deco on the other side of the hilt.
I think it's pretty old.

For the blade marks, maybe it's JC or JO ??