| Issuer | Soviet Union |
| Year | 1981-1988 |
| Type | Circulating commemorative coin |
| Value | 1 Rouble (1 SUR) |
| Currency | Rouble (1961-1991) |
| Composition | Copper-nickel |
| Weight | 12.8 g |
| Dimensions | 31 mm |
| Thickness | 2.3 mm |
| Shape and Technique | Round Milled |
| Orientation | Medal alignment ↑↑ |
| Engraver(s) | |
| In circulation to | 1991 |
| Reference(s) | Y#188.1, Y#188.2, Schön#138 |
| Obverse description | The arms of the Soviet Union dividing the country name with the value below. |
| Obverse script | Cyrillic |
| Obverse lettering | СС СР
1
РУБЛЬ (Translation: US SR 1 Rouble) |
| Reverse description | Yuri Gagarin, the first human being to enter outer space, with launching rocket of Vostok to the left and space station Salyut with two docked Soyuz spaceships to the right, and hammer and sickle with dates above centre. |
| Reverse script | Cyrillic |
| Reverse lettering | 20 ЛЕТ ПЕРВОГО ПОЛЕТА ЧЕЛОВЕКА В
КОСМОС
1961 1981
Ю.А.ГАГАРИН (Translation: 20 Years of the First Flight of Man in Space 1961 1981 Y.A. Gagarin) |
| Edge | Plain with incuse lettering. Both types are at the photo: |
| Mint | |
| Mintage | 1981 - Y#188.1; Leningrad Mint - 3 962 000 1981 - Y#188.1; Proof; Leningrad Mint - 1988 - Y#188.2, Proof restrike (edge `1988.H.`) - 55 000 |
| Catalog ID | 5408866670 |
| Comments |
