Here are two Medallion Twist pattern bar spoons marked “Derby Silver Co.”; they measure approximately 5 and 1/2 inches long. This pattern was made by Redfield & Rice circa 1870. Edwin Brittin worked for Redfield & Rice and when they went out of business their machinery was brought to the newly formed Derby Silver Co. by Edwin Brittin in the early 1870s. These Medallion Twist pattern spoons might have been made with one of the Redfield & Rice moulds.
The Medallion Twist bar spoon was featured in Derby Silver Company’s 1883 catalogue.
They are available for sale here at my Etsy shop: https://www.etsy.com/listing/686389267/two-derby-silver-co-medallion-twist-bar