What is this concave circle on the side of my milk jug? There's only one, there isn't an opposite shape on the other side.. : r/whatisthisthing

What is this concave circle on the side of my milk jug? There's only one, there isn't an opposite shape on the other side.. : r/whatisthisthing

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This ornate cast metal piece. It is concave. Measures 13-1/2 x 7. Weighs 3 pounds. No maker's marks that can be seen, but there's a heavy patina on back. No moving parts. There's a hole in both the top and bottom. : r/ whatisthisthing

Why do milk jugs have these? : r/whatisthisthing

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What are the circles on the side of milk jugs for? - Quora

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