Catalog
| Issuer | Nigeria |
|---|---|
| Year | 1991 |
| Type | Standard circulation coin |
| Value | 1 Kobo (0.01 NGN) |
| Currency | Naira (1973-date) |
| Composition | Copper plated steel |
| Weight | 2.57 g |
| Diameter | 17 mm |
| Thickness | 1.66 mm |
| Shape | Round |
| Technique | Milled |
| Orientation | Medal alignment ↑↑ |
| Engraver(s) | Geoffrey Colley |
| In circulation to | 28 February 2007 |
| Reference(s) | KM#8.2a |
| Obverse description | Emblem |
|---|---|
| Obverse script | Latin |
| Obverse lettering | FEDERAL REPUBLIC OF NIGERIA UNITY AND FAITH, PEACE AND PROGRESS 1991 |
| Reverse description | Oil derricks |
| Reverse script | Latin |
| Reverse lettering | 1 kobo |
| Edge | Smooth |
| Mint | |
| Mintage |
1991 - - |
| Numisquare ID | 5320691060 |
| Additional information |
Historical Context: The 1991 1 Kobo was issued during General Ibrahim Babangida's military rule in Nigeria, an era of economic structural adjustment and democratic transition efforts. Part of the decimal currency system established in 1973, this KM#8.2a variant marks a significant material shift to copper-plated steel. This change from earlier bronze compositions reflects a pragmatic national response to rising material costs, reducing production costs for low-denomination coinage.
Artistry: Engraver attribution is rare for Nigerian circulating coinage of this period; designs follow a functional, nationalistic style. The obverse features the Nigerian coat of arms—an eagle atop a shield supported by two horses—encircled by "FEDERAL REPUBLIC OF NIGERIA" and "1991." The reverse presents a minimalist design: the large numeral "1" above "KOBO," with "NIGERIA" above and the date below, emphasizing clear legibility.
Technical/Grading: Key high-points for strike assessment on the obverse include the eagle's head, horses' manes, and the shield's intricate details. On the reverse, the numeral "1" and "KOBO" are crucial. As a copper-plated steel issue, strike consistency can vary, often softening finer elements. The plating is susceptible to wear and environmental corrosion, which can expose the underlying steel core, impacting the coin's aesthetic appeal and preservation.