Lake Saimaa - Definitive stamps m30 10 mk I

Lake Saimaa

Different types of this stamp:

156 I light grey violet. Thin lines, indistinct details. Clouds almost invisible. (1930).
156 II a Dark grey lilac. Thick lines, distinct details. Clouds well visible. (1932).
156 II b reddish lilac. Thick lines, distinct details. Clouds well visible. (1943).