under-spur-leather

1711, Jonathan Swift, Letter to Esther Johnson dated 9 October, 1711, in Letters Written by the Late Jonathan Swift, London: C. Bathurst et al., 3rd edition, 1769, p. 61, I have instructed an under-spur-leather to write so, that it is taken for mine.

1816, Walter Scott, The Black Dwarf in Tales of my Landlord, Edinburgh: William Blackwood, Volume 1, Chapter 12, p. 242, […] I have opened house, not only for the gentry, but for the under-spur-leathers whom we must necessarily employ.