Looks like the back cover for bulkhead mounted
electronics. Notice it has a sleeve for a wire. I had older data
marine depth that had these mounted inside on the bulkhead to help dress out the business end. Ritchie NC-20 Navigator Bulkhead back cover
Something like this maybe
Sale: $30.00
Manufacturer: Ritchie
Compass
Manufacturer Part No: Nc-20
Quantity:
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Navigator Bulkhead back cover for model no. BN-202.