A 19th Century Walker patent gunpowder magazine

A 19th Century Walker patent gunpowder magazine, in the form of a copper drum having a raised rim with drainage hole and swing handle, outer lid fitted for a padlock and enclosing a raised brass rim around the central opening, felt lined turned wooden plug revealing the inner copper lid, interior with six japanned tins fitting radially around a central tin, lid and body marked 'WALKER PATENTEE WAPPING'.