Turkish State Railways (Türkiye Cumhuriyeti Devlet) watches are considered rare and desirable collector's items due to their unique history and specific engravings. This one has Unitas 6497, a famous and widely used manual-wind mechanical watch movement of Swiss origin [12]. It is well-regarded for its robust design, reliability, and large size, making it a popular choice for both pocket watches and modern, oversized wristwatches used in luxury watches like Panerai, Omega, Tag Heuer, U Boat, Hamilton, Tissot..,