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 amongst 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!