| Issuer | United Kingdom |
| Year | 2017 |
| Type | Non-circulating coin |
| Value | 250 Pounds |
| Currency | Pound sterling (decimalized, 1971-date) |
| Composition | Silver (.999) |
| Weight | 625.3 g |
| Dimensions | 100 mm |
| Thickness | |
| Shape and Technique | Round Milled |
| Orientation | Medal alignment ↑↑ |
| Engraver(s) | Obverse: Jody Clark Reverse: Louis Tamlyn |
| In circulation to | |
| Reference(s) | Sp#BSL1, KM#1521 |
| Obverse description | Fifth crowned portrait of HM Queen Elizabeth II right, wearing the George IV State Diadem, legend around. |
| Obverse script | Latin |
| Obverse lettering | ELIZABETH II·D·G·REG·F·D·250
POUNDS·
J.C (Translation: Elizabeth the Second by the Grace of God Queen Defender of the Faith) |
| Reverse description | Standing figure of Britannia as the outline of Great Britain with trident in right hand and shield in left, legend around. Trident anniversary mark at 3 o`clock |
| Reverse script | Latin |
| Reverse lettering | BRITANNIA 20 OZ FINE SILVER 999 2017 ψ LWT |
| Edge | Reeded |
| Mint | |
| Mintage | 2017 - Proof - 103 |
| Catalog ID | 6356302150 |
| Comments |
