Clark Manufacturing Company of Buffalo, New York sold knobs based on the patent of E.M. Mix and J.E. Mix. #127089 The knob has a latch hinged in a transverse slot near the end of the shank, which, when closed enters one of a series of slots cut into the corner of the spindle. To complete the system a two-part rose is used. The knob is seated against the inter rose and the outer rose covers the latch to prevent it opening. The last picture is an example of the connection type knob

Info above was shared by an avid collector. See the pics for details and perfect condition.

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I am glad to combine shipping. I don't use a set policy, if you by multiple items, pay for them all, and once I combine the orders, I will credit you.

I do my best to describe my items, most are antiques, or architectural salvage, please look at pictures carefully, ask questions. I