Lincolnshire Imperial Yeomanry officers tunic button c.1901 to 1908

A good original 1901 to 1908 period 'Lincolnshire Imperial Yeomanry blackened white metal small tunic button'; embossed shield bearing cross and Fleurs-de-Lys within title surround; the reverse impressed with maker's details 'J.THORNHILL & SON LINCOLN'. Very good condition, complete with original shank.Diameter approx 18mm.