marriage of Mary Walsh to Walter James Smith

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I was wondering if anyone could help me in finding the marriage of Mary Walsh to Walter James Smith around 1874??? They had a son born in Cork in 1874 named John. Walter was in the Royal Navy and was with the Coast Guard. I am hoping because John was born in Cork that Mary Walsh may have come from the same area. They moved to Portsmouth a little after that because the next two children are born in Gosport/Portsmouth area.
Thank you for you help
Patricia