Northumberland Fusiliers Volunteer / Territorial Battalion Silver Plated Officers Medium Pattern Button

Circa 19mm in diameter, fix shank and back marked JR Gaunt & Son Ltd, London, Engd, silver plated, in a plain line circle. It has some staining to front and wear to plate on hight points but this pattern is a very hard button to find. Coll Col. Denis Wood ( 2nd Edn) No 648 refers. Coll.