German, Flour Bag Seal, Image by StuE, Found by Saxonman
Found in Beccles Suffolk.
An anchor with a capital S in a dotted border on the other side are the letters R.M. and below O/I.
From Michel Royer, "German flour mill seal. For rye flour type O / I (R.M. - Roggenmehl - Rye flour) - difficult to assign because no owner or place name."