George I Britannia Silver Mug, 1719, William Fleming

• Britannia Standard - A higher grade of silver than sterling silver. Britannia standard silver contains at least 958 parts per thousand of pure silver, while sterling silver contains at least 925 parts per thousand of pure silver.
  
  The Britannia standard was obligatory in Britain between 1697 and 1720 and after that was optional, so there are very few silver items that come onto the market that are Britannia standard.
  
  Not to be confused with silver plated Britannia metal items, often marked as "EPBM", a pewter type alloy, that when unplated can be temporarily polished to a silver-like lustre.

This item has been included into following indexes:

• Fleming, William (London) - silver, maker or retailer 6
• mugs, single handles - silver items 232