Vintage (possibly antique) felling or bucking saw.
A felling saw will have a curved spine. It is used for cutting down trees.
A bucking saw has a straight spine and is used to make lumber or cut logs into smaller pieces.
The handle is missing and has been replaced by a hand made one.
The value of these saws is increasing every year. The process to produce these saws is no longer used.
The blades are tapered in thickness by grinding so the blades are thinner in the center and at the back. The felling saws particularly are more rare and therefore more valuable.