Perhaps the chekker is a myth.  I wanted to have something other than slides of artwork to show what may have been around in the 1400's.  This instrument is convertible too.  As you can see, the keys fit in for vertical or horizontal performance.  The earlier the instrument the more rosettes.   


Check the gilded trefoil key fronts - very classy!  This instrument is a bout 2 feet long and sits on the TV.

Jack Peters Harpsichords
14330 Phinney Ave N.
Seattle, WA 98133
(206) 364-8254