Though time worn she is in terrific condition.  Both turning knows function well. There is no case nor any instruction manual for her but thar latter one is available online readily.  You can see the age in her but she is operational and very useful. Unlike most duplexes this one is akin to acting like a miniature Fowler Magnum in that it has sine, tangent, reciprocal,  and log values to be read only on one side whilst the other provides a great calculating machine.