17th Century knife with bone handle.
Detail from a Andre Bouys painting, 18th Century.
Central Piedmont 1600-1710.
Mid 18th Century bone handled knife.
Remember, not all, or even any of your equipment has to date to your impression, you can legitimately use equipment from a much earlier period. I am using knives now that are over 100 years old, so there is no reason why they would not have been doing the same in the 18th century.
Author's Blades that he carries.