Hi Roger,
I cannot be very much help, I'm afraid.
The handle looks like Beech. The patent date wording on the medallion is funny if it is a British saw.
Patented Dec 21 1859
Doesn't show up for much related to hand saws, but the same month/day but with a year of 1869 does show up as for saw nuts. It is the Munger patent:
Datamp
The saw looks like a Richardson Brothers, but instead of a shield/coat of arms they had basically a maltese cross.
Sheffield Saw Works from Cincinnati had a coat of arms--I think--but I cannot find my only example to check. They were later purchased by Disston.
If the patent date is actually of the year 1869 and if the patent date refers to the saw nuts/bolts, there were 3 people who used that patent:
Shurly Dietrich - Galt, Ontario Canada
Richardson Brothers - Newark, NJ
Harvey W. Peace - Brooklyn, NY
As you are from Canada, who knows, that could be a Dietrich saw, but I have never seen one.
More non-information than you wanted, I'm sure. Thought I would share as far as I could get without a sharp closeup of the medallion.
Take care, Mike