"Signe "Ham" Hammarsten-Jansson (née Hammarsten, 1 June 1882 Hannäs, – 6 June 1970) was a Swedish-Finnish graphic artist who designed, among other things, around 220 Finnish postage stamps during the course of three decades. She was the mother of Tove Jansson, creator of the highly successful Moomin characters." - (Wikipedia (en) 10.04.2020)
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