| Issuer | Japan |
|---|---|
| Year | 870-890 |
| Type | Standard circulation coin |
| Value | 1 Mon |
| Currency | Mon (683-1953) |
| Composition | Copper |
| Weight | 2.8 g |
| Diameter | 19.5 mm |
| Thickness | |
| Shape | Round with a square hole |
| Technique | Cast |
| Orientation | |
| Engraver(s) | Fujiwara Ujimichi |
| In circulation to | 25 November 0987 |
| Reference(s) | DHJ#1.55 - 1.58 |
| Obverse description | Four characters around hole |
|---|---|
| Obverse script | |
| Obverse lettering | 貞 寳 觀 永 (Translation: Everlasting treasure of the Jōgan era (read clockwise)) |
| Reverse description | Plain |
| Reverse script | |
| Reverse lettering | |
| Edge | Smooth |
| Mint | |
| Mintage | ND (870-890) - DHJ# 1.55; large characters - ND (870-890) - DHJ# 1.56; 貞 and 寳 have short feet - ND (870-890) - DHJ# 1.57; wide 貞 with spread feet - ND (870-890) - DHJ# 1.58; small 貞 - |
| Numisquare ID | 3575722370 |
| Comments |