The origin is clearly stamped on the base of the cruet - Sheffield. However I note you have posted this under "Sheffield Hallmarks" so I guess you think it is silver. In fact it is electroplated. Walker & Hall were one of the few electroplating companies who date-coded their wares (although not all W&H output is coded). Here we have a Greek omega which I think is the code for about 1907. Don't hold me to this - I may be completely wrong.