Royal Doulton Character Mug/Jug – Old Salt with Mermaid Handle – D6551 – 1960. Condition – Very Good Pre-Owned. This piece is titled ” Old Salt ” with a style number of D6551 and is a beautifully sculpted and painted depiction of an interesting old sea captain, with a beautiful mermaid serving as the handle. The general consensus is that. Toby Jugs were named for an 18th-century Yorkshire man who got the nickname Toby Fillpot after he drank 2,000 pints of Yorkshire stingo (ale). A Toby Jug is a figural ceramic pitcher modeled in the form of a popular character, historical, fictional or generic. It can be a person or animal.