The caption in B/P-B tells us that the watch has a Cal. 28.20 with 13''' which is actually based on the Peseux Cal. 300. The general text for G-P also tells us that G-P was bought up by Otto Graef in the 1930s and that MIMO was an already existing brand of Graef's. I am not entirely sure who made the watch (G-P for MIMO or MIMO for G-P) but at least it does not seem to be a Ukrainian or Argentinian contraption.
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