You are bidding on a Western Electric Type 620 B INPUT transformer.  It was removed from a piece of Western Electtric audio equipment.  I am unable to find the specifications, but the coils are good, measuring 162 ohms from terminals 1 to 3 with a centertap at 2.  Terminals 4 to 6 measure 850 ohms with a centertap ot 5. It is in fairly nice clean condition,  It measures roughly 1 3/4 by 2 1/2 inches in cross section, and is 3 1/2 inches tall, not counting the terminals or mounting bolts.  It is a quality transformer that should be great for your project.  Shipping weight is 1.75 pounds.  Please see my other auctions for more interesting radio and audio items, and tubes.