Co-incidence...or spooky-ness?
This stamp got me researching. It's the 1964 Sierra Leone free-form self-adhesive.

The stamp is on a postcard from Samuel Jones and Company Ltd of London who supplied the paper for the stamps.


The postcard was printed by the Walsall Lithographic Company Ltd who printed these stamps for Tonga

This stamp was part of an SCF auction put up by Bas S Warwick who has an avatar of USS Constellation... which, from 1859-61 was the flagship of the USN Africa Squadron and disrupted the slave trade in the area around SIERRA LEONE... which in 1964 released the.....well, you know...