Examples of the type

Private collection
1966 ⟐ – (en) KM# 14.1 (Type 1; 1.21 g), dot in diamond
21 mm • 1.2 g

Private collection
1968 ♦ – (en) KM# 14.2 (Type 2; 1.23 g)
21 mm • 1.23 g