Hello Richard,
It's an Indian Army Issue WWI period kukri. Not having markings on those kukri is very common, sometimes you get the soldiers number along with the battalion and regiment, but more often than not you don't.
What you have put down as a fuller is infact a decoration groove, if you look up 1907 pattern bayonet you see what a fuller is there, and a single fuller like that on a kukri is these days refered to as Angkhola.
How bad is the rust?
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