John These were aftermarket options. One of the major manufactures was Mallory. They pretty much had dual point distributors for about any make years ago.
I had a Mallory unit on my '38 8-cyl sedan. It performed very well, even in the many "wound way up" occasions at the drag strip. (And we won the class every time we took it there!)
Using a dual point distributor gives you a longer dwell time. As you get to 8 cylinders and above, this becomes more important due to the decreased dwell. On 12 and 16 cylinder engines a dual point or even two separate distributors is required
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