The auction estimate should give you a clue, admittedly not the only clue, unless it's some no-name house that has never seen a Reverso. A good example from the 1930s should be 3 or more times this estimate. There are a couple of bad examples from the 30s that a German auction house has been flogging for over a year now, which fail to bring the US$4000 or so that they want, but they keep reappearing every couple of months.
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