This 3c commemorative from British Guiana marks the 1966 Royal Visit to the Caribbean, issued shortly before the territory became independent Guyana. The design features formal oval portraits of two senior members of the British royal family, set against a radiant deep-blue background with a crown motif. The typography is crisp and celebratory, capturing the diplomatic significance of the tour. Printed in rich blue and white, the stamp reflects late-colonial Caribbean philately and is a notable issue from the final months of British Guiana’s postal history. A desirable piece for collectors of royal visits, Caribbean issues, and pre-independence territories.