Tetarteron - Alexios I Komnenos Thessalonica
€1.00
| Issuer | Byzantine Empire |
| Year | 1092-1118 |
| Type | Standard circulation coin |
| Value | Tetarteron = 1⁄864 Hyperpyron |
| Currency | First Hyperpyron Nomisma (1092-cca. 1300) |
| Composition | Copper |
| Weight | 3.71 g |
| Dimensions | 19 mm |
| Thickness | 2.1 mm |
| Shape and Technique | Round (irregular) Hammered |
| Orientation | |
| Engraver(s) | |
| In circulation to | |
| Reference(s) | BCV#1929 |