The cession of the Spanish province of Florida to the British crown by the Treaty of Paris in 1763, and the subsequent division of the territory into the two British provinces of East and West Florida, brought in its wake the introduction of new legal and administrative arrangements. One of these was the replacement of the Spanish seal for the province by two British royal seals, one for each new province.
"The Great Seals Deputed of British East Florida,"
Florida Historical Quarterly: Vol. 61
, Article 6.
Available at: https://stars.library.ucf.edu/fhq/vol61/iss1/6