Type Blotter. Very simple design.
Product Name Unknown, usually these are just called "rocker blotters
Manufacturer and Year Most likely made in the 1930s or 40s.
Length The wooden holder measures 2-3/4" by 6-1/2". The rocking blotter portion is about 2-1/8" by 6". The height is a little under 2" not including the knob.
Blotter System After writing whatever with your fountain pen or wet rollerball, lower the blotter onto your page. Then grip the handle of the blotter and move it back and forth in a rocking motion over your words, careful not to drag or smear. Lift the rocker blotter straight off the page. The blotter comes fitted with a thick sheet of blotting paper. To replace it, slide the curved steel plate out and wrap around it a new sheet of blotter paper, cut to size, then slide it back into the grooves
Color Wooden blotter with perhaps walnut wood and a wooden knob.
Condition Excellent condition. The blotter has been used but the wood grain looks shiny and nice as does the wooden knob. The blotting page has been used. We've photographed how it looks. The metal roller has some tarnishing on the inside but this can probably be cleaned up.