The term "Shefflied Reproduction" usually means that the piece is silverplated over copper.
Here's two possibilities for the sphinx mark:
John Batt & Company, London, England.
Joseph Sankey & Son, Bilston, Wolverhampton, near Birmingham, England.
They were known for their copper and brass wares. Don't know if they produced silverplated items.http://www.oldcopper.org/sankey.htm