Here is an antique silver plated julep strainer that is marked “Derby Silver Co.” It measures just over 5 and 1/2 inches in length and the bowl measures approximately 2 and 3/4ths inches wide. It has a star cut-out on the handle.
It is rare to come across a julep strainer with the Derby Silver Co. mark. Of particular interest is the placement of that mark inside the bowl. That placement of the mark indicates that this was considered the back of the strainer and supports the placement of the strainer, bowl side down, in the drink when being served (indicated by Harry Johnson in his 1888 book, “The New and Improved Illustrated Bartender’s Manual”). Please see my blog post “The Victorian Bar” to read more about this:
This strainer is available for sale here at my Etsy shop: