Verrrry interesting!
The only comment I can offer is a paralell development in Australia where there are some double skinned doors in existence without any pattern at all.
I have one of these (NOS) in my collection and have always assumed these were made post-war as replacement parts, and are possibly without a pattern because the original presses had been destroyed.
But in the case of your door I don't have a satisfactory explanation. Possibly it was another of the prototype designs?
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