I take your point; I meant the general principle, really. The style here is rather tighter than typical stage productions, but that doesn't of itself guarantee authenticity. The style is easily pastiched by a professional; and Clifton was certainly that. Here is some more material:

At  Bodleian Library Broadside Ballads:

clifton, harry, 1832-1872

At  Lester Levy:

The Waterford Boys Written By Harry Clifton. Arranged by M. Hobson. London: Ashdown & Parry, Hanover Squre, n.d.

Plus a good few others, including Where The Grass Grows Green (I'm Denny Blake from Country Clare...); Paddle Your Own Canoe; The Dark Girl Dress'd In Blue; Darby McGuire; Polly Perkins of Abington Green; Pulling Hard Against the Stream, and so on.