The TS-15 handsets were normally used with BC-1000 radios and could have also been used with BC-1306 and GRC-9 as well as other war time radios, It has a PL-55 plug for the speaker and a PL-68 Socket for the microphone. The TS-15 handset has a built in PTT switch Push to Talk Switch.
Unfortunately these handsets do not have the speaker or microphone elements installed, other than that they are in good condition. Useful to recondition a TS-15 handset which has a bad cable or the rubber is rotting away.