I’m not sure what the odds of finding a Maori wood carving at a tiny fleamarket in Kassel are, but I suspect they’re quite slim. Here you go:
This type of flat wooden fighting club is called a Mere, and this one specifically appears to be a Waihaka. They are obviously no longer used in battle but are now often sold as decorative objects in my husband’s native New Zealand. Some Maori carvings run to the many thousands of dollars in price as the work involved is so labour and skill intensive and there are now strict regulations in place about how the wood for these carvings is sourced.
The inlay is made from Paua shell and a little label on the underside of our mere tells us that it was hand carved in Rotorua by the Ruihana artists’ cooperative. I suspect the cooperative has since been dissolved as the most recent mention of them that I can find is in a New York Times article from 1989.