'A badge for a Knight of the Order of the Holy Sepulchre in bronze and dating somewhere around C13/14th possibly very slightly later . This is a very scarce item and it relates to The Equestrian Order of the Holy Sepulchre of Jerusalem being a Catholic chivalric order of Knighthood that traces its roots to Godfrey of Bouillon, principal leader of the First Crusade. According to reliable sources in the Vatican and Jerusalem, it began in historical reality as a mixed clerical and lay confraternity (association) of pilgrims which gradually grew around the most central of the Christian holy places in the Middle East, the Holy Sepulchre or the tomb of Jesus Christ.This would have been a pin for a member of the order , there is a mark on the reverse where the original pin would have been fixed '
Ref Mitchiner p244 939 - 941