Obverse

Head of King Baudouin I facing left. Designer below, flanked by mint mark and privy mark.

Script: Latin

Lettering: ELSTRØM

Engraver: Harry Elstrøm

Reverse

Olive branch and value. Legend in French above, year below.

Script: Latin

Lettering:
BELGIQVE
20F
1991

Unabridged legend: 20 Francs

Translation: Belgium

Engraver: Harry Elstrøm

Edge

Geometrical pattern (varieties in shape)
with horizontal brackets above and below.
Note: varieties on the edges exist. Different brackets alignment.

Mint

Royal Mint of Belgium, Brussels, Belgium (983-2017)

Marks

Robert Vogeleer, Coins Commissioner, Royal Mint of Belgium (1963-1987)Romain Coenen, Coins Commissioner, Royal Mint of Belgium (1987-2009)

Comments

Varieties for rim sizes were reported, and coins from 1980 are supposed a narrower rim compared to next years, which have a broader rim.
3 sizes of rim strikes occur for 1980: narrow, medium, and wide.