There are two varieties of the coin. It is easy to identify from the ribbon on the emblem below SINGAPURA written in the observe.

The first variety was minted between 1987 and 1991 wherein the ribbon was pointing upwards. Also the stars in the emblem was an outline.

In the second variety minted between 1992 and 2011 the ribbon was pointing downwards and the stars are fully filled with the shape.

Country	Singapore
Year	1992-2011
Value	1 Dollar 1 SGD = 0.79 USD
Metal	Aluminium-bronze
Weight	6.2900 g
Diameter	22.3 mm
Thickness	2.4 mm
Engraver	Christopher Ironside (reverse)
Shape	Round
Orientation	Medal alignment ↑↑

Coin Information Courtesy: Numista