#2494a Turkey - PTT, 150th Anniv. S/S (MNH)
1990 PTT (Turkey Postal Service), 150th Anniversary, Souvenir Sheet of 4, #2491-2494. Designs: Past and present communication methods: 200 l, Post rider, truck, train, airplane, ship. 250 l, Telegraph key, computer terminal. 400 l, Telephone switchboard, computerized telephone exchange. 1500 l, Power lines, satellite.