4 Pin EF Johnson (123-210-200) NOS for 811A / 572B / 866A / 8020W

4 Pin EF Johnson NOS ceramic bayonet socket (123-210-200) with (2.5" wide ceramic base) for 3B28, C3J, 8020, 811A, 812A, 866A, 572B

1) aluminum collar

1) nickel collar

- 1 picture shows 8020W plugged into 210 socket

- 1 picture shows 210 stamped into socket base