Very informative Drew. In 1902 they had separate model designations, the lowest grade was in fact The Durston Special. The next higher grade was the "I" grade. Later they combined the Durston & the "I" Grade, evident in your 1917 E.G. Simmons catalogue illustration.
An interesting observation, they did not use a hinge pin. They used an adjustable detent "ball" shown in the two photos. It works well, locks up tight as possible. A very clever innovation I hadn't seen before. If it got loose just tighten it up, so simple.
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