Wazzit? Got me stumped!

front view

side view

backside

opening and lugs

contacts at bottom of opening


Five lugs in opening, seems to be slot at bottom

Found a****st some old parts

 

boat...

 

One of those boat light sockets.

 

boat light

 

Removable stalk anchor light base.

 

I can scrouge up more if you found a new hobby,lol.

 

Boat mooring light socket

 

Yep. It's a socket for a stern light.

 

Come on ....Find something harder! I did!