| SPECIFICATIONS | |
| Denomination | Rupees One |
| Alloy | Copper-Nickel |
| Diameter | 25.4 mm |
| Thickness | 2.0 mm |
| Weight | 7.13 gms |
| Shape | Round |
| Edge | Security edge |
| DieAxis | 0° |
| Mint | Royal,Llantrisant |
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| KM #136 | ||||||||||||||||||||||
Obverse : The Armorial Ensign of Sri Lanka 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
ශ්රී ලංකා (Sri Lanka) in Sinhala, centered on top. All within circle of dashes along periphery with raised rim.
| Year | Edge | Issue |
| 1972 | Security | 7,000,000 |
| 1975 | Security | 31,500,000 |
| 1978 | Security | 37,018,000 |
| 1982 | Milled | 75,000,000 |
| 1994 | Milled | 50,000,000 |
From 1996 the One Rupee was issued as a Nickel Plated Steel coin which in appearance and weight and size is identical to this Cupro-Nickel issue it replaced, except being attracted by magnets.
The coin was scaned at 600 dpi and the images are displayed at 250 dpi.