The blade is 10in. It might be a replacement. Is that a toy saw? Or a pruning saw? The handle has a unusual shape (to my eyes). Owners marks read E.B. and J.Mc Arthur.
Nice little saw, with "character". Thanks for posting it. Comments and guesses (WAGs); - It might have started out with a longer blade, as a typical "table" saw or "pruning" saw, and is now shortened and with a "new" nib filed in. - Unless the handle is tiny, for a child's hand, it probably didn't get sold as a toy saw - The handle style is a little more elaborate and looks quite a bit older than Nick's "curiosity" saw handle - If it has no name stamp (remnants can usually be found), it may have originally been etched instead of stamped