SPECIFICATIONS:

Type: Single conversion,  solid state,  superheterodyne receiver. This is an Eddystone Model 1004 rebranded and sold as "Sentinel" by Marconi Marine International Company.

Frequency range: 150 to 535 KHz and  1.6 to  30 MHz in seven ranges. Ten crystal controlled frequencies can be accommodated.
Modes: CW / MCW / AM (A3H)
Circa: 1972 to 1981
Mains Power:  Normally 100 to 130 VAC or 200 to 260 VAC, 40 to 60 Hz   Can be switched to emergency 12 VA  12 or 24 VDC power,
Weight - 17 lbs
Dimensions in inches- 19W x 5.25H x 10D

An Eddysstone  Model 1004. (Photo courtesy Eddystone Company)

When the model 1004 was rebranded, this is how it looked. (Photo courtesy of Teneo.org)

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Contributors and Credits:

1) Model 1004 data sheet provided by :  http://www.eddystoneusergroup.org.uk/Data%20Sheets/Marine%20Comms%20Receiver%201004%207-73.pdf
2) http://www.teneo.org/doc/new/Marconi%20Ship%20Station/index1.html
3) Ross Bradshaw [ross.bradshaw@mypostoffice.co.uk]
4) Mariner Magazine  July-August 1972

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