The Tissot 13.6 is a manual wind mechanical watch movement that features a sub-second function. It is similar to the ETA 1132 but has a larger base plate. The movement is often or always marked with the signature 1120 on the dial side. The specific differences between the Tissot 13.6 and other movements such as the 1121, 1123, 1125, 1127, 1129, 1131, 1139, and 1289 are not known. The Tissot 13.6 movement was commonly used during the period around 1950.