This press was designed by George W. Prouty, a must simpler press design than the one he designed and sold while owing his own business.  It sounds like he sold the design to Kelsey shortly after his own company was sold off.  This press was commonly sold for years by Kelsey as their 7x11 treadle press.  The next size larger was the Kelsey Union press.  For smaller presses Kelsey didn't offer treadle presses, but had a huge line up of hand press.