Library steps, Roy Sherwood

A classic set of wood and brass library steps with green leather on the steps.  Tiny working casters too!  Vintage and made by Roy Sherwood, they have a mark underneath that I can't make out completely, just an initial R.  However, they are identical to other confirmed Sherwood steps.  The lens distortion in some of my photos makes it look as though the uprights aren't quite vertical but they are.  

1 5/8 inches (4.1 cm) wide, 1 5/8 inches (4.1 cm) deep, 4 3/4 inches (12.1 cm) tall.