Can you help us identify this find?

Saw

Last week’s excavations produced a number of new and exciting finds, one of which is shown above. A saw blade maybe? Found in the walled garden it could be part of a horticultural tool, or a surgeons saw from the battle? Further tests and research are underway. Can anyone help us identify this blade?
If you think you have the answer please let us know. All help is much appreciated. Please post your answers at Facebook https://www.facebook.com/waterloouncovered or on twitter at https://twitter.com/DigWaterloo