A rare binaural Knight's stethoscope.
This is essentially the same as a 'Cammann' but with a modified
spring mechanism to keep the ear pieces opposed. The spring
mechanism is signed "Codman &
Shurtleff Boston". The stethoscope itself is in excellent
condition with minimal loss of its nickel plating. The silk binding
has on one of the rubber tubes has been replaced (some time ago).
The chest and connecting pieces are made from gutta-percha
