"You have an outstanding piece of Victorian fishing tackle on your hands. William B. Mumford of Kansas City, Missouri was granted Patent #402,270 on April 30, 1889 for his simple yet effective tin that did indeed clip to a fishing rod. It was designed to not only preserve any live bait attached to your hook, but also to keep you from hooking yourself. Very early--likely within just few years of the patent--the rights to this invention were purchased by the Enterprise Manufacturing Company of Akron, Ohio, world-famous purveyors of Pflueger fishing tackle. It appears your tin is in very good shape and has a great deal of collector interest, not just from tackle nuts but from tin collectors (a whole other kind of nut) as well. Value is $100-$150 but may go higher than that. They do not appear very often in good shape."