About the Design:

Obverse
Mammy Yoko

Lettering:
MAMMY YOKO
TEN LEONES

Engraver: Avril Vaughan

Reverse
Denomination encircled by Bonga fish

Lettering:
REPUBLIC OF SIERRA LEONE
10 LEONES
1996

Engraver: Avril Vaughan

Edge
Smooth

Comments
Mammy Yoko (1849–1906) was a leader of the Mende people in Sierra Leone and Queen of Kpa Mende Confederacy.
Bonga Fish (Binomial Name: Ethmalosa fimbriata)

Composition    Nickel plated steel
Weight            2.5 g
Diameter    17.99 mm
Thickness    1.47 mm
Shape             Round