Scott Essen has found an old hand saw that has no makers mark on it that he can see,
The saw has two saw medallions, one having King George the 3rd and the second the Royal coat of arms and the date 1788. The saw has a rusted blade which Scott doubts is the original.
Scott cannot find any information on the internet and would love to find out if this saw really dates back to that period.
Simon Barley has provided this phot of the original etching on the Guinea Saw. See his comment below.