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Preserve Jars
Move over, Mason jars. Classic pieces of folk art—stoneware containers used to pickle and preserve vegetables have been gaining in popularity. You'll be able to tell them apart from more modern, mass-produced jars by their hand-painted cobalt-blue stripe, which typically only goes halfway around. The more bands the piece has, the more valuable it is, Baker says. Each piece can go for $150 to $500.

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