Here ya go !
You got a pretty sweet call there hang on to it. http://refugeforums.com/refuge/showthread.php?t=532862
From DU Magazine legends of the call article.
Charles Ditto – Keithsburg, Illinois
In addition to being a farmer, game warden, market hunter, waterfowl guide, and champion trap shooter, Charles Ditto was also an entrepreneur. He was granted a number of patents for waterfowl decoy devices, and later went into the game-call-making business.
Ditto's calls resembled those made by his friend, F.A. Allen. Perhaps the most famous of Ditto's calls were the Eureka models, which were produced from around the turn of the century until the mid-1920s.
Many of these early calls were constructed of two pieces and featured a hard rubber insert and brass reed. Ditto later sold five other types of calls, many of which he helped put together, until a shooting accident resulted in the loss of one hand.
The rarest of the Ditto calls is a unique all-metal combination duck and goose call. He is also credited with making hard rubber. calls.