GPO KEYSENDER No. 5 (KEYCALLER) For GPO TELEPHONE EXCHANGE?
GPO PO Exchange earth bar for small UAX, solid copper with solder lugs.
6 Vintage GPO & PO Isolation Spanners Post Office Telephones exchange tools
Vintage GPO 312F Black Bakelite Rotary Telephone - Call Exchange Party Line
GPO UAX13 Strowger Exchange - Machine, Pulsing and Ringing No. 2A
