German, Flour Bag Seal, Stettin, RM II Seal, Image & Found by Paul Manning.
Found at Islip in Northamptonshire. approx 17mm diam.
A continuous raised circle contains on one side RM with II beneath and on the other side W.xM
R.M. - Roggenmehl - Rye flour
See p.15, Meelloodjes, een ‘verborgen’ geschiedenis, B. D. Poppen, "From the former German city of Stettin several seals are known, both of the Dampfmühle and of the Walzmühle. The Walzmühle was founded in 1838, located directly on the Oder, over which the grain was brought in by barges."