The vignettes engraved for the 1894 set of North Borneo were also used for their 1897 set.
The 2.5d of the 1898 New Zealand set is engraved by A.B. Hill, but the die proof has the annotation 'SHELL with Mr Rapkin', which implies he worked on the die as well.
STAMPS BY YEAR
North Borneo, Definitives, 8c
Sirmoor, Definitives, numerals and currency on all values from 3 annas upwards
Belgian Congo, Definitives (? could have been Rapkin Sr as well)
North Borneo, Definitives, 3c, 5c, 8c, 12c, 18c and 24c frames only
New Zealand, Definitives, whole set except 2.5d, 5d and 1s, possibily corraborating on the 2.5d
Sirmoor, Definitives, portrait only
- The Die Proofs of Waterlow & Sons, Part 1, Great Britain & the Empire to 1960, Colin Fraser and Robson Lowe (1985)