Arthur Price of England Sovereign Silver Plate. The very best and most luxurious silver plate cutlery on the market, with a silver thickness of up to 40 microns. Unconditionally guaranteed for life and will offer a richness of patination, in time, that is beyond compare. Dishwasher Safe. Quintessentially English, the Britannia pattern is based on the threaded Old English patterns of the 1750s which have enjoyed international popularity ever since.