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Sipp-O has provided only a few pins for members over the years.  Once popular, they have faded in popularity and are not commonly made anymore.
The first pin available is this Sterling silver lapel pin sold at the 1961 Winter Banquet as a fundraiser.  The pin was manufactured by E.J. Caldwell and is stamped on the back with his name and 'Sterling'.  This pin was not produced specifically for Sipp-O, but was one of many that could be ordered from the Caldwell catalog.
Hat pin version of patch S19.
Hat pin version of patch S20, but with FDL instead of diamond behind deer.
Hat pin version of patch S21.