Rare Teac NAB adapter 1/4 inch black with base plate

1/4 inch used adapter from an old Teac machine these are becoming harder to find, I know someone in Japan is still making them but without any Teac Tascam Labels ,but I have yet too find them.

This one is Unusual in fact its the only one I have ever seen its a hub and a small metal baseplate that fits the hub I guess it was designed to raise it a little as they made the unit too small, no idea really its a one off