The 2017 1oz Silver Britannia Special Edition Coin — Trident Privy is struck by The Royal Mint from one troy ounce of .999 fine silver. It features a Trident privy mark, adding a small but distinctive design detail to the standard Britannia format.
The coin retains Britannia as the central design subject, while the obverse carries the monarch portrait used for the year of issue. The special edition treatment gives the coin a separate identity from the standard bullion release.
Privy-mark Britannias are collected as companion pieces to the annual bullion run because they preserve the familiar design while adding a limited-theme feature.