These are whimsical ceramic coffee mugs with characters from "Moomin Valley." If you aren't familiar, Moomin Valley is a beautiful fictional place where the Moomins live a peaceful life amongst lush nature. Tove Jansson is the author and illustrator of several books about Moominvalley.
The mugs can sell for over $200 on eBay in used condition. Here are a few of the highest priced sales:
Rauha Peace Mug sold for $250 on 2/26/15
Green Moomin Mug Piirustus sold for $150 on 2/14/15
Rare Moomin Mug Muumitytto sold for $132.50 on 2/1/15
Now keep in mind these are the top sellers. eBay shows 24 listings for Moomin mugs which indicates this item is rare and hard to find. But these mugs are out there. And since these mugs are rare and valuable, make sure you price them high enough. If you run an auction, make sure you set the starting price high so that if you only get one bid, you are ok with the sale. Only 3 of the 24 listings are auctions. The rest are fixed price either with or without best offer.