Going back to a point a few days ago about Hunslet's song and it's origins, here is part of a news cutting from 14th April 1892, two weeks before the final v Leeds. It's the 4th round at Brighouse.
Albert Goldthorpe got possession, and although surrounded by opponents, dropped a really magnificent goal. What a yell was there, my countrymen, the OLD Hunslet war cry, and the singing of the OLD tune, which has so often greeted similar performances of our Albert.
It does therefore seem that it started sometime before the 1892 final, and will probably never be known when exactly.