No doubt that the brushed gold dials, like yours, were a smaller subset of the larger group. I really don't know how many were manufactured, but 40 strikes me as too small a number, given the number that have appeared over the years. That's not to say that there are more than a few that have been seen and/or sold, but rather that I would have expected a much smaller number relative to such a tiny production run.
For some context, the hand-wind Gübelin Jubilee chronometers, of which I have also owned two, were produced in a run of 400, and I think that I have seen around the same number of GP Observatory models over the years. It's not a perfect gauge, of course, as more of the Gübelin probably ended up in "strong hands" as a result of geographic and demographic variables, and they are more esoteric.
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