The battery used was the WS18 type: Battery, Dry, 162/3volt, and the tapped HT section provided 150 volt HT and -12V grid bias.
In addition to the instruction card, the actual working instructions were provided on a fairly indestructible aluminium plate, anodised so that the plate was black with silver lettering/lines.
The Royal Navy knew the set as "Type 621" and there was B.R.1746 which contained the full set of EMERs.
The backpack was also available without any of the set fittings, and with the hole in the side blanked off by a circular tinplate disk. This was Satchel, Signals, No.3 ZA.14869 and may simply have existed as a spare for replacement purposes.
The rubber disk with the frequency list in it is also the protective cap for the set connector.
Chris.
(I need an instruction plate and also the aerial rod carrier to complete my set, if anyone has a spare.)
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