Four submarine cables testing keys, manufactured by H.W. Sullivan, London.

At the ends: Reversing keys, both bear the inscription “Key Testing No.1 Catalogue No. WY 2367”

Their serial numbers are 6119 and 6619. They were  manufactured several years apart, with different materials.

At the center type T1129, serial number 64109.

At the back: Discharge key, Serial No. 7759/1962.