Antique Mission Oak Taboret Table – Arts & Crafts

I thought this was an interesting taboret table that I purchased a couple years ago in Walnut, Iowa at the Fathers day weekend show. I just have never been able to identify it or seen another one. Measures 15″ x 15″ and 20 1/2″ Height, the sides and top is 1 inch thick. With the cut out and angle of the sides I thought maybe an early piece of Limbert. Has a bentwood support on either of the opposite ends that help hold the bottom shelf. Any thoughts?