Type:  A solid state autoalarm receiver for  2182 KHz only.
Mains power 115-240AC, 50/60 Hz or 24V DC or 110 VDC
Vintage: July 1974 ,
Successors Warden III (June 1975) and Warden 4.

Features:
1)  RF protection overload from ship's own 2182 kHZ transmitter.
2) A two tone (1300 and 2200 Hz)  audio signal is used for alerts.
 

Warden 2 Autoalarm. (Courtesy Marconi Mariner magazine)

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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 29/20