Stuart welcome , was it a badge or a button as it was also called, any docker carrying a button would be assure of work when ever casual labour was required on the docx in those daysAppreciate your response, my Dad was born 1945, always said he was a war baby.
I have his death certificate. I met his brothers and sister when I was small. They still lived in Dublin, Oliver Bond flats. That would have been mid 70s.
He always said his Dad worked the docks and had a badge??
Not great maths but perhaps Dad's dad might have been born around 1920?