Worthington Gold began as "Severn" (without gold accent) in 1940. Severn was discontinued in 1974, but the pattern has been revived in a large dinner size under the new name.
This pattern is now considered "Made to Order". If you order 8 or more dinner settings, the made to order pattern would be 6 months. If you order less than 8, it would be 12-18 months as they will wait to produce the product until they at least have orders for 8 or more.
HH stands for "Hollow Handle", which means that the item has been made with a hollow sterling silver handle, and a stainless steel utensil has been inserted into it. Generally, the dinner knife handle is used for serving pieces, and a smaller version is used for the Butter Knife and Butter Spreader.