Additional views of the P&S adjustable cleat.


The Polk knob was patented in 1903. The specimen in my collection is the only one  10 POLK. On close examination, the date is actually MCH 9103. The knob was  The serrations on the bottom provided a gripping surface to prevent the knob from turning.


e specimen inmy collection is the only one


Polk patented knob August 2017 15


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