Joe, I posted this on huntingpa and a guy said these calls are being made today. I wonder who bought Willis's name/rights or if someone else is making calls from pens.
Over the years I was given several small, pocket calls from makers plus call makers/members of this site. Arrow shafts, small wooden tube, Deer horn and such, all small like the top of a pen, so very easy to lose, so very easy to break.