Thanks for the photos.
Definitely an Imperial and not a Hummer.
However, it's possible that it was packaged wrongly by Duncan. It wouldn't be the first time. It happened quite a bit following the bankruptcy in the middle to late 60s. This is from later, from the 70's and made by Flambeau, but I wouldn't be too surprised. If the packaging was intact, it could be of interest to some collectors (but leaving packages unopened is not my cup of tea).