I later found out that this pillar, along with three others, once stood around the base of the Clock Tower at the top of North Street.I was informed that there were two others lurking in bushes at the bottom of Roedean School. I'm not sure what happened to the fourth one or what happened to the one at the Open Market after demolition but here's some photos of three of them at least. Colour photos date 2017 and the black and white one from 2012.