German, Flour Bag Seal, Stettin, RM 2 Seal, Image & Found by Mark Fawkes.
Found in Leicestershire, 21mm.
R M / 2? // (ST)ETTIN, ...IHER curved down WAL(Z)MüHLE curved up around
From Jan van Oostveen, "Stettin Walzmühle and RM stands for Rogge Mehl"
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."