Hi Ben, I have read your story with interest.
I have a similar Calender in WG, with no.1230284, and I have had it for approx. 30 years along with 2 others with the same movement. When I bought it, at an auction of an estate, I left to my usual repairman, who send it to Universal, a brand that was widely distributed in Denmark.
They serviced the watch, and faxed back that they would like to buy it !
It was apprearantly not in their collection, but I declined because I like the model.
In the following correspondence, they made it clear that very, very few was made, 12-20 pieces, making it extremely rare.
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