Excellent condition .. likely new / unused ... Atwater Kent WD-11 breadboard tube socket. AK to my knowledge never made a set that used the WD-11 so this socket is hard to find and possibly fairly rare.I would assume it was made to complete their socket line and likely sold as a part for home construction of sets using the WD-11 tube.

ATWATER KENT WD-11 TUBE SOCKET NO. 3895.  It is in excellent condition...looks like it has never been used!
The top of the socket surface is marked: "ATWATER KENT -PHILA." and "PAT'S PENDING".  Additionally, each binding post is identified:  "P", "F", "F" and "G".  Underneath it is marked "#1-AK" and "3840". The base is 2 5/8" in diameter.
Very well packed shipping weight will be 12 ounces from zip code 24012.

Please note: The WD-11 tube shown in one picture is for illustration only and is NOT INCLUDED.