This is an interior car classification plate from the Japanese National Railways (JNR) "O-zashiki" (tatami room) train, the "Slo 81 2102". "Slo 81" indicates the car type, with "S" representing a Green Car (first class) and "Ro" representing an ordinary passenger car. In the former JNR era, there were other car types such as "Kuha" (control car with a driver's cab + ordinary car) and "Moha" (motorized intermediate car + ordinary car). "Slo 81" indicates the type of O-zashiki passenger car that the JNR once owned. "2102" is the individual car number within that type. This classification plate was installed on car number 2102 of the Slo 81 type passenger car, which was used as an O-zashiki train. 30cm x 4cm Engraved lettering. How do you like it, train enthusiasts? (^^)