Teresa Mary "Tessie" O'Shea (13 March 1913 – 21 April 1995) was a Welsh entertainer and actress. Born in Cardiff to Nellie Theresa (née Carr) and James Peter O'Shea, a soldier who was the son of Irish emigrants, Tessie was reared in the British music hall tradition, appearing on stage as "The Wonder of Wales" as early as the age of six. By her teens she was a pro known for her popular BBC Radio broadcasts and appearing on stages in places as far afield as South Africa. She frequently finished her act by accompanying herself on the banjolele.

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