The St. Thomas Quatrefoil is copied from a 14th or 15th century example now in Salisbury.
Product details: Spencer, Brian. Salisbury Museum Medieval Catalogue: Pt. 2, Pilgrim Souvenirs and Secular Badges. Salisbury: Salisbury & South Wiltshire Museum, 1990. Nos. 35-36.Dimensions (H x W): 1 1/8 x 1 1/8 inches 28 x 28 mm