Saint Christopher Reverse Crystal Intaglio Charm VINTAGESterling Silver Saint Christopher Reverse Crystal Intaglio Charm Reverse crystal intaglio charm depicting Saint Christopher, within a sterling silver setting under domed glass. Also known as sport crystals, Essex crystal, bubble charm, rosettes or cabochons, these charms were made circa 1950 and are highly collectible. Image 3 shows the charm pictured in a 1950s charm catalogue. Saint Christopher is a saint known as the patron saint of travellers,