Wow! A very rare and unusual Walter Lampl Guilloche Enamel over Sterling Silver Box for heart charm. It appears to be part of his 1940s Birthstone Collection, probably May w/a faux emerald. It measures appx 1.25" tall and 1" wide. Hinged. Hallmarked WL in Shield for Walter Lampl and STERLING. The padlock heart inside is also Walter Lampl, but just shown for reference; it isn't included. The Guilloche enamel is in Very Good Condition. No chips or scratches. Box has no damage, just light tarnish.