Established "May 1952 by Hamilton's Ltd" per Wikipedia
See also publisher Hamilton & Co.
Under editor Gordon Landsborough
from 1954, Panther Books became a successful paperback reprint publisher.
Panther was an imprint of Granada
from about 1968 to 1995.
British Library record BL 000526594
for Panther Books #1489 reports:
Publication Details: London : Hamilton & Co. (Stafford), 1963.
Series: [Panther Books. no. 1489.]
WorldCat library record OCLC 771458010
for Panther Books #1502 reports (quote):
Publisher: London : Hamilton & Co., 1963.