Shanghai 上海 began production of the SS1 movement in 1966. While the most well known early model using the SS1 is the 1120, the factory also produced a significant number of 1110 models. The difference between the two was the type of case. The 1110's was chrome-plated base metal, while the 1120's was all stainless steel. This 1110 dates to April 1968.