Wells Sterling Silver Mustard Seed Pendant or Charm with Proverb

From Wells and dating to the 1960s or so, here's a Sterling Silver (hallmarked as pictured) heart pendant or charm. With a concave dome top, the plastic encases a single mustard seed. At the back is a portion of the proverb from Matthew 17:20 - he who has faith the size of a mustard seed may move mountains. Size is 11/16" high (without ring) x 9/16"; height is about 1/4". Weight is 1.2 grams. Condition is very nice with all parts of the charm readable. Just needs a jump ring and if I'm reminded, I will add one.