Page 527 - Jarvis & Wright: Jamaica Display to RPSL

Jamaica: Air Mail

Rates to the UK
Evolution Through the 1930s

Jamaica (15 May 1934) to New York by Air then by Sea to UK at triple rate (2s1½d)

The triple, 1½oz rate is complicated to calculate, consisting of:
A surface rate of 1½d for first oz & 1d per additional oz, plus airmail rate of 7d per ½oz plus 2d registration.
2s1½d = 25½d = 1½d + 1d + (7d x3) + 2d. This rate applied 18 Dec 1933 to 21 Oct 1934.
Jamaica (10 Apr 1937) to New York by Air then by Sea to UK at 8d Rate

8d rate applied from 22 Oct 1934 until 31 Dec 1937.