PTT AŞ released a special day envelope on the theme “International Symposium: 100 Years of the National Palaces” on 24 November 2025.
On 24 November 2025, PTT AŞ put on sale a 70 TL special day envelope themed “International Symposium: 100 Years of the National Palaces”, available at PTT branches in quantities matching the number of subscribers and on PTT AŞ’s website www.filateli.gov.tr.
On the same day the philatelic item went on sale, a special date postmark bearing the inscription “Uluslararası Sempozyum Milli Sarayların Yüzyılı 24.11.2025 İSTANBUL” (International Symposium: A Century of the National Palaces) began to be applied to the envelope during working hours at Ortabahçe Cad. Büyük Beşiktaş Çarşısı Zemin Kat No:10 Beşiktaş/İSTANBUL.
