Up for sale here is this NOS rare vintage Western Electric 255L input transformer.  This is in great shape except for some wear on the top from storage/handling.  It is guaranteed to work.  This measures about 3.5" x 2 5/8" x 3 3/8".  I measured the impedance from one terminal to another, and here are the impedances:
Terminal 1 to terminal 2: 125 ohms
Terminal 3 to terminal 4: 1670 ohms
Terminal 4 to terminal 5: 2174 ohms

Please see my pictures for details.

US shipping and handling is $15, and international is $80.  If you have any questions, please ask.

I have more transformers and other vintage electronics listed--feel free to take a look!