RAF flying helmet wiring loom impedance switch.
Type 110, Air Ministry Ref. No. 10A/13163.
This 4 ½" x 1 ½" metal switch fits in line of the type C, D & E Flying Helmet wiring looms (see last two A.P. photos).
This particular unit is in a very good 'used' condition and has been cut from a loom.
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