I can't believe this, but I have been waiting over 20 years to get my hands on an Excalibur Elite dado!
This think is really interesting! The Excalibur dado set was originally a two-blade wobble dado, but the "Excalibur Elite" features three blades, each with carbide teeth around the parameter and a couple offset teeth that work like chippers for the "in between" sizes. You use the two outside blades for cuts from 1/4" to 1/2" and you add a third blade to the stack for cuts from 1/2" to 13/16". The weird thing that took my brain some time to get around is that none of the blades are wobbling, and one might assume.
At the bottom of this post you'll find two videos, one of me opening the dado after receiving it from the eBay seller and the second explaining what I learned studying the manual and the US patent.
Also, I've found very little info about this funky dado set, but as I uncover more I'll add it here.
Here's the history of Vermont American: https://vermontamerican.com/vermont-american-history/
More to come.