In the changing climate, long sea level time series are essential for studying the variability of the mean sea level and the occurrence of extreme events on different timescales. This work summarizes the rescue and quality control of the ultra-centennial sea level data set of Trieste, Italy. The whole time series is characterized by a linear trend of about 1.4 mm yr⁻¹, the period corresponding to the altimetry coverage by a trend of about 3.0 mm yr⁻¹, similarly to the global ocean.