Heddon Research two piece cardboard box

Photo courtesy of  collector Don Grimm

The best thing about  collecting & studying old fishing tackle is that there is always something new to learn. This past March , I did a write up about Heddon's  Research bait program.  At that time,  I had not seen a two piece Heddon  cardboard box marked research.
I just recently  learned of this example of a  generic  Heddon Sonar Research  marked box. I'd love to hear of any other 2 piece cardboard research marked lure boxes or history of the plain box.To see more about Heddon research baits check out my March post on the subject. Thanks, Don for sharing this unusual box.