British:"ROYAL ARMY MEDICAL CORPS BRASS BUTTON" (Large, 25mm, WW1-WW2, O/R's)

This button is large (24mm). Made by 'J. R. Gaunt & Sons, London', and stamped with their details on the reverse (see photos). Issued and used. Sliding shank intact. Good detail and in good condition considering age (WW1-WW2 period).