It was during his debut season in England that Harkin won his first senior representative honour, leading the line for Northern Ireland under-23's in a 5–1 defeat by Wales at Vetch Field, Swansea, in February 1963.
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At the end of 1966–67, the "Magpies" finished just above the re-election positions, and accepted a £2,000 bid for Harkin from Southport, newly promoted to the Third Division.
Terry Gilliam | Terry Pratchett | Terry Riley | Terry Bradshaw | Terry Jones | Terry Wogan | Tom Harkin | Ellen Terry | Terry Richardson | Terry Reid | John Terry | Terry Scott Taylor | Terry Eagleton | Terry Woods | Terry Tempest Williams | Terry Pluto | Terry Manning | Terry Francona | Terry Callier | Terry | Terry Venables | Terry-Thomas | Terry Melcher | Terry Sweeney | Terry Paine | Terry Norris | Terry Fox | Terry Dene | Ralph Terry | Terry Winters |