This is one hotel I've yet to track down. Looked in Canada and South Carolina but no matches at all.
Jackson China manufactured this 10 1/4 inch service plate in 1957. The heraldic shield in the well consists of keys, castles and stripes and topped with a crown, all in coin gold and maroon. A wide maroon band encircles the verge and accented with gold lines. A banner reading ST. JOHNS HOTEL is below the shield.
Excellent condition!