Michel # 647; Scott # 622; Stanley Gibbons # 771; Yvert # 636;
	The Great Ribbed Cockle . Cardium costatum.
	Color: multicolored
	Date of Issue: 15.06.1981
	Face Value: 4.00 E
	Designer: no information
	Stamp Size: 37 × 25 mm.
	Stamp Quantity: 500 000
	Perforation: 12:12½

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