UK, Two Pounds 2017 Silver 1 Ounce 0.999 'Britannia 20th Anniversary' Capsule & Pliofilm packet, UNC

2017 marks the 20th Anniversary since the Britannia Silver Billion Coin was first released. To mark this occasion, the original design by Phillip Nathan has been updated to include an anniversary mark to denote the respective anniversary.
The obverse of the coin also includes the introduction of a new guilloche finish providing an additional level of security for investors.