4 Answers

....three 

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All that, and I find it hard to believe the estimate on this Duograph is "only" $20-40,000. In 2020, this same example sold link at Phillips for about $33,000, so I'd expect the estimate to be fair, too. It sold for about the same price before that in 2017. link It's a lot link of vintage chronograph for the money.

Brand Nivada GrenchenModel Chronomaster link Chronoking with interchangeable bezelsReference Number 86056M01LO Broad Arrow link 86054M01LO Paul Newman Dial 87042Q01 Chronoking MecaquartzDiameter 38mmThickness 13.75mm manually-wound Chronomasters 13.4mm Chronoking MecaquartzCase Material link SteelDial Color Black Broad Arrow white Paul Newman black ChronokingIndexes Applied Paul Newman and Chronoking printed Broad ArrowLume YesWater Resistance 100mStrapBracelet Various