Quarter inch jack has to be older than most, as it's pre-1900. Still standard equipment on hi-fi, guitars, headsets and other uses. Even the screw on 1/4 to 3.

Quarter inch jack has to be older than most, as it's pre-1900. Still standard equipment on hi-fi, guitars, headsets and other uses. Even the screw on 1/4 to 3.5mm adaptor has become standard. Only smartphones decided to be awkward.