None of the stamps removed from the two imprimatur sheets have a top margin. There are only four imperforate examples recorded which show a top margin and therefore cannot come from the imprimatur sheets.
History: Ex Latto, Shaida & Aureum (for sale by SG for £15’000)
The GB Journal, vol.12 no.6, Nov 1974, pp.127-129, “The Imprimatur 2 1/2d 1887 Stamp” by Douglas Latto
The GB Journal, vol.25 no.1, Jan-Feb 1987, p.14, “Imperforate 2 1/2d Jubilee” by Douglas Latto