See'd 'em

My grandfather was boorn in Bilston and spent most of his adult life after the Great War working in Lysaght's Steelworks in Newport, South Wales. A tall man with bright blue eyes he was not good at withstanding the heat but thankfully as a checker he was not too near the furnace. My father told me that after he had checked sheets of steal he would mark the top one with chalk - See'd 'em (not quite sure on the spelling, the point is that he had seen them).