| Issuer | United Kingdom |
|---|---|
| Year | |
| Type | Coin pattern |
| Value | |
| Currency | |
| Composition | Brass |
| Weight | 0.51 g |
| Diameter | 18.57 mm |
| Thickness | 0.54 mm |
| Shape | Round |
| Technique | |
| Orientation | Medal alignment ↑↑ |
| Engraver(s) | |
| In circulation to | |
| Reference(s) |
| Obverse description | Crown and patent details |
|---|---|
| Obverse script | |
| Obverse lettering | R. WALKER’S No. 13 ½ ER PATENT |
| Reverse description | Mirror image of obverse |
| Reverse script | |
| Reverse lettering | |
| Edge | Plain |
| Mint | |
| Mintage | ND - - |
| Numisquare ID | 6449824850 |
| Comments |