I posted this review elsewhere and someone mentioned it had a striking resemblance to this vintage Sinn 103.
On the Guinand website they mention this:
Quote:
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Our HS100 model pays homage to the late 1960s/early 1970s and a pilot chronograph from that era designed by Helmut Sinn.
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But I wasn't sure exactly which model they were referring to. I'm going to assume it was this Sinn 103:
It was found here:
https://www.shucktheoyster.com/sinn-...ometer-exotic/