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Possible late 1800's. The box says England as I suspect the tang does. Post 1891. Could be 30 years newer though. The style is of later Wostenhom.

That is a more "modern" grind IXL. It will make an excellent shaver. Round pointed and with double stabilizers. I would say anything goes. Bone would be nice.
While we are here with this pic, see...

Wostenhom made a great variety of blades. All sizes, grinds, shapes, and weights, all marked IXL. They have their name on ancient razors thru the 40's I think. It would be imperitive to see the blade...