how to tell between OS & NS C&P Pilot?

I now own 2 C&P Pilots which are slight different in design from each other. I was wondering how do you tell between a OS and a NS Pilot? I believe that I have one of each but I don’t know which is which.

Thanks!

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The old style has a much more ornate casting. The new style is much more modern with a large oval opening in the side casting, and bolt locations on the inside of the base of the press.
Here are two images from the museum the first of a new, and the second of an old style.

image: Chandler-Price-Pilot-NS.thumbnail.png

Chandler-Price-Pilot-NS.thumbnail.png

image: Chandler-Price-Pilot.thumbnail.png

Chandler-Price-Pilot.thumbnail.png