Michel # 135; Scott # 1044; Stanley Gibbons # 131;
	The Whooper Swan . Cygnus cygnus.
	Color: green
	Date of Issue: 19.07.1951
	Face Value: $ 20
	Designer: no information
	Stamp Size: 18.5 × 21 mm.
	Stamp Quantity: 98 500
	Perforation: 12½

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