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20 Lire The Keys of the Town
| Issuer | San Marino |
| Year | 1979 |
| Type | Commemorative circulation coin |
| Value | 20 Lire (20 SML) |
| Currency | Lira (1864-2001) |
| Composition | Bronzital (92% copper, 6% aluminium, 2% nickel) |
| Weight | 3.5 g |
| Dimensions | 21.3 mm |
| Thickness | 1.5 mm |
| Shape and Technique | Round Milled |
| Orientation | Coin alignment ↑↓ |
| Engraver(s) | Pietro Giampaoli |
| In circulation to | |
| Reference(s) | KM#93 |
| Obverse description | Crowned arms of the Republic of San Marino |
| Obverse script | Latin |
| Obverse lettering | REPVBBLICA DI S.MARINO
LIBERTAS (Translation: Republic of San Marino Liberty) |
| Reverse description | Set of keys dividing value, on background of a medieval city gate. Date at bottom. |
| Reverse script | Latin |
| Reverse lettering | LIRE 20
1979 |
| Edge | Smooth |
| Mint | |
| Mintage | 1979 - In sets only - 125 000
|
| Catalog ID | 8272200920 |
| Comments | |