This is a joint project made with Sir Bohemond of Boots by Bohemond. You can purchase a set of the fittings here, just the 5 faces shown, the center mount and catch. You can see finished coin purses on Sir Bohemond's site here
http://boots-by-bohemond.myshopify.com/collections/pouches
3 1/4" wide, 8.5 cm