This paper presents and discusses information about the observations and data reductions of a time series of photometric measurements of sigma Sco that has been collected in 1972 and 1974. Nearly two thousand standardised uvby magnitude differences sigma Sco minus tau Sco, together with unpublished instrumental differential magnitudes, are herewith supplied. This extended dataset will enhance the applicability of these more than four decades old measurements when used in studies based on data obtained with modern-day techniques such as robotic and space telescopes.