I'm not giving away any "State Secrets" here, so I'll include a few examples of what we have to work with in the factory records.
First photo is from the Order Book with specific a choke request.
Second photo is from the Stock Book where the choke patterning can be extrapolated from the entry.
Third photo is from the Order Book where the patterning is cut off from the image, which is how the majority of the pages are photographed.
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