A Foster Introscope, Serial number 111767, 6 volts, in chromed metal, with additional lenses...
A Foster Introscope, Serial number 111767, 6 volts, in chromed metal, with additional lenses and bulbs, in fitted wood case; a Foster Introscope, Serial number 110511, 6 volts, in three brushed steel sections, one of standard magnification, another of twice standard magnification, with electrical lead, in fitted oak case (2 - suitable for gun barrel inspection,)