Set of 5 commemorative discount tickets for the opening of the Toei Subway Line 6 (Shimura - Sugamo section), issued December 27, 1968. Line 6 is the current Mita Line, and Shimura is the current Takashimadaira Station. This is the first opening commemorative ticket for Line 6, as it commemorates the opening between Shimura (Takashimadaira) and Sugamo. * Toei Subway Line 6 (Shimura - Sugamo section) Opening Commemorative Discount Tickets: 5 Design: Toei 6000 series / Stainless steel train with a red stripe (red line color) * Commemorative paper case color: Blue-gray (Photos 2 and 3 show the commemorative paper case, and photos 4 and 5 show one ticket) These were carefully stored in the back of a closet along with other documents. As shown in the photos, they are unused and in a clean condition with no noticeable stains, scratches, or discoloration, but please forgive any oversights as they are nearly 60 years old. Note: The design of the commemorative tickets featured the Toei 6000 series stainless steel train with a red stripe, which debuted at the time of the opening, but the line color was later changed to green. The subsequent openings of the Toei Line 6 (Mita Line) were as follows: * 1972 (Showa 47) Hibiya - Sugamo * 1973 (Showa 48) Mita - Hibiya * 1976 (Showa 51) Nishi-Takashimadaira - Takashimadaira * 2000 (Heisei 12) Mita - Meguro opened, completing the line, and mutual operation with Tokyu Corporation began at Meguro.