Jimmy Stewart's character is confined in a plaster cast and makes good use of a back scratcher in Alfred Hitchcock's 1954 movie Rear Window. He uses the back scratcher several times, not only to scratch his toes or to reach an itch inside his cast, but for emphasis when gesturing as well.
A close up view in a screen grab provides enough detail to identify the markings on it. It is made of hand carved bamboo with interesting detailing on the long handle.
I see similar back scratchers on eBay occasionally such as this one on eBay