'Swell' songs reached a peak in the 1860s with the Lion Comiques like the Great Vance competing with George Leybourne to see who could produce the most popular song. (Champagne Charlie). However their popularity lasted till about 1900.

Kilgarriff gives in Charles Coburn's repertoire 'I'm a swell with toothpick and crutch', but I can't find anything under 'Market-street Swell'.

Billy Weekes, where are you?