There's not much to go on, is there? You know that bit on the Antiques Roadshow where they ask about how the piece was acquired - if you do know anything else about where this came from, there might be some clues as to age and country of origin.
If it is very old, you might be able to see a boundary between the body of the tool and an inserted and welded strip of harder, crucible steel. (There was a long discussion on this in the context of plane irons here,
laminated-irons-again-t108019.html but i believe the principle applies to other edge tools such as your drawknife. ) If it's hard steel throughout, it's more likely to be 20th century.
The problem with identifying the maker is that edge tools like this, along with agricultural tools such as billhooks and axes, weren't all made in Sheffield - not so many generations ago, every village had a blacksmith who could make you one. I don't know of a comprehensive historical study of all the local smiths' marks, though there may be one. Geoffrey Tweedale has researched
900 Sheffield makers but that's a book I don't have and am not about to buy.
Your man probably had a first name that began with J - such as James or John - which are far commoner than names such as Ian beginning with an I. Capital I was used for J well into the nineteenth century and later still if it was part of a long established trademark such as "I SORBY."
I've looked in a few places for IF or IE but not found anything. The places I have looked include:
- A 1787 directory of Sheffield, which includes a lot of similar initial marks.
- Bob Burgess's list of makers at
http://billhooks.co.uk/edge-tool-making ... ew/a-to-g/
- The 1919 Sheffield directory of trade marks.
- Eileen Woodhead's booklet "Trademarks on Base-Metal Tableware" (which has a big overlap into edge tool makers).
The handles might have provided a clue as to the age and source - can you say if they were whittled or turned? If they were turned and entirely identical, they were probably relatively late and were made on an automatic copy lathe.
I think there is a slight preference for pear shaped handles on French drawknives, but that might be a function of the specific trade use as well as country of origin.
All that said, you've still got a useful tool and it won't be hard to put it back into working order.