| SPECIFICATIONS | |
| Denomination | Rupees One |
| Alloy | Copper-Nickel |
| Diameter | 25.4 mm |
| Thickness | .0 mm |
| Weight | 7.13 gms |
| Shape | Round |
| Edge | Security edge |
| DieAxis | O° |
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| KM #133 | ||||||||||||||||||||
Obverse : The Armorial Ensign of Ceylon with
இலங்கை in Thamil on left,
ලංකා in Sinhala in middle,
and CEYLON on left in a scroll at its bottom. All within circle of dashes along periphery with raised rim.
Reverse : A traditional Sinhala design using the Pineapple motif. Value in big
රුපියලයි in Sinhala,
and smaller
ஒரு ரூபாய் in Thamil,
and ONE RUPEE
below and year of issue at the bottom,
with traditional Sinhala Liyavela art on either side, and country name
ලංකා (Lanka)
in Sinhala centered on top. All within circle of dashes along periphery with raised rim.
| Year | Alloy | Issue | Mint | Proof |
| 1963 | Cu-Nickel | 20,000,000 | ||
| 1965 | Cu-Nickel | 5,000,000 | ||
| 1969 | Cu-Nickel | 2,500,000 | ||
| 1971 | Cu-Nickel | 5,000,000 | Yes |
The Proof coin was scaned at 300dpi and the images are displayed at 250dpi.