A traditional unit of quantity for furs equal to 2 score or 40. This unit, which persisted at least into the nineteenth century, originated because furs were shipped in bundles of 40 pressed between two boards or timbers
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}