German, Flour Bag Seal, WM II Seal, Image & Held by Mike Patrick.
From Ebay, 19mm, 8.9g.
Blank // WM / II
From Mike Patrick, "Weizenmehl - Wheat flour".
See BSG.BS.00783 for a similar German flour bag seal bearing R.M. - Roggenmehl - Rye flour and see BSG.BS.00785 for a German flour bag seal the bears RM on one side and WM (WxM)on the other.