This is a super slide box of rare Dennison seals. As this great seller points out, the box of six seals is replete with three each of two iterations. Dennison sold these boxes with each leaf iteration on the front to maximize and extend their product line. This design first appears in their 1924 Bogie Book and were sold with stock number H684. See both examples in the Decorations section, one on page 245 and the other on page 248. Guide value ranges from $180-200.
08/18 Update: Wow, these brought a very strong price of $227.51, not surprising due to the cool image factor. This design, as well as its counterpart, are amongst my favorite of Dennison designs.