Accutron Vibrograf Watch Holder
This is the Portescap Diapatest DT 311 watch holder for my Vibrograf B100 timing machine and is designed for checking Bulova Accutron tuning fork watches (and mechanical watches, too). It's transistorized and power is supplied through a RCA phono plug connection to the Vibrograf timing machine.
Neither watch holder had connectivity between the PCB and crystal. The cause in both cases was the spring wire that connects the movable head to the base through the arm. It had broken at the rear arm connection. Shown is the spring wire after disassembling the head and pulling off the yellow plastic insulation.