The Genuine GPO BT20/4 Black Bakelite telephone connection block is a collectible part from the 1930s-1950s. Made in the United Kingdom, this unit is a classic piece of telephony history. The black Bakelite material adds to its retro charm, making it a sought-after item for collectors of vintage telephones. This telephone connection block is a genuine piece of GPO equipment, perfect for enthusiasts looking to restore or display their vintage telephone collection.