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Very interesting, thanks! I stumbled upon this site a few weeks ago:

The site is sometimes broken - and the book that it's advertising doesn't seem available on Amazon anymore. But some articles on the site do work:

https://tradingpithistory.com/2020/12/kansas-city-board-of-t...

The above has fascinating embedded videos.

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I notice that the first video is from a PBS programme. Funny thing, I first learned about the hand signals from another PBS production, Open Outcry (https://www.imdb.com/title/tt0816256/). It was once uploaded to Youtube in several parts, but unfortunately I cannot find the playlist anymore.

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