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I am unfamiliar with this in mold stamped back mark. Is it Redwing? If it isn’t
Redwing, do you know who manufactured it? It is on the bottom of a 6 1/2″
H. X 5 1/2″ diameter wax seal canning crock with a 3 1/8″ diameter
mouth. Thank you in advance…
Cary, RWSCo stands for “Red Wing Stoneware Company. So yes it is Red Wing. Your piece is a Red Wing Safety Valve jar. Your jar normally came with a medal hardware that would snap the lid in place once the jar was filled with preserves or other garden canned items. Al Kohlman