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        1 Mon 'Kan'eitsūhō' Bosen, large hole reverse ト TO    
    
| Issuer | Japan | 
| Year | 1864 | 
| Type | Coin pattern | 
| Value | 1 Mon | 
| Currency | Mon (683-1953) | 
| Composition | Copper | 
| Weight | 3.3 g | 
| Dimensions | 24.5 mm | 
| Thickness |  | 
| Shape and Technique | Round with a square hole Cast
 | 
| Orientation | Medal alignment ↑↑ | 
| Engraver(s) |  | 
| In circulation to |  | 
| Reference(s) | C#1.14s, DHJ#4.215 | 
| Obverse description | Four characters around hole | 
| Obverse script |  | 
| Obverse lettering | 寛 寶 通
 永
 (Translation: Currency of Kan`ei)
 | 
| Reverse description | A letter upper, indicates Mito Domain | 
| Reverse script |  | 
| Reverse lettering | ト (Translation: To)
 | 
| Edge | Plain | 
| Mint |  | 
| Mintage | ND (1864) ト - dot of ト connected - ND (1864) ト - dot of ト separated -
 
 | 
| Catalog ID | 3371473680 | 
| Comments |  |