Thayer Wooden Wonder Box circa 1930: scarce

At first glance this looks like a one handed production box but it is not.  It is a wonder box made from wood. I have exposed the load gimmick. It is metal and is removable and can be placed on either door as it slides on a channel on the door.  a remarkable find.  The size is 5.5x4x3. Second one i have seen and some of you know I had a very large Thayer collection at on time. Photos do a nice job of displaying the condition which is used but still good functioning perfectly. circa 1930.

Estimate $400-700