This is a solid state autoalarm receiver for  2182 KHz only.
Mains powerL 115-240AC, 50/60 Hz or 24VDC
Known variants: Warden II, (July 1974) , Warden III (June 1975) and Warden 4.

Features:
1)  The device is fitted with squelch circuitry thus enabling a loudspeaker watch.  .
2) RF overload protection against ship's own 2182 KHz transmitter.
3) The device incorporates a self test button.
 

Front panel view

Rear view showing connection points

Top and rear view.

Rear view.

Top view..

Nameplate

All photos in this table courtesy Marktplaats.nl web site

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Contributors and Credits:

1) http://www.marktplaats.nl/a/telecommunicatie/zenders-en-ontvangers/m808189361-marconi-marine-ontvanger.html?c=3c
1f5dcc18d02a99040ca8de656940d2&previousPage=lr
2) Frans van Woerkom  <frans(at)van-woerkom.net>/font>
3) Ross Bradshaw [ross.bradshaw@mypostoffice.co.uk]
 

Mar 26une 1/14