I like the covers of the old Arrow anthologies. Here are a few:
Arrow Book of Horror Stories, 1965.
Alexander Woollcott, Moonlight Sonata
Arthur Machen, The Novel of the Black Seal
E.F. Benson, Mrs Amworth
F. Marion Crawford, The Upper Berth
H.P. Lovecraft, The Dunwich Horror
Guy de Maupessant, Was it a Dream?
Bram Stoker, The Judge's House
Charles Collins and Charles Dickens, The Trial for Murder
J.F. Sullivan, The Man With a Malady
Anon., Sawny Bean and His Family
Bram Stoker, The Squaw
A.J. Alan, The Hair
Fitz-James O'Brien, What Was It?
H.G. Wells, The Cone
F. Marion Crawford, The Screaming Skull
The Second Arrow Book of Horror Stories, 1965
F. Marion Crawford, The Dead Smile
E.F. Benson, Caterpillars
H. Russell Wakefield, Montrous Regiment
Elizabeth Bowen, Telling
Ray Bradbury, The Veld
Graham Greene, A Little Place Off the Edgware Road
Colin Evans, Nowehere Without Her
Robert Bloch, The Sorcerer's Apprentice
L.P. Hartley, The Travelling Grave
Edgar Allan Poe, The Murders in the Rue Morgue
Dennis Wheatley (ed), Quiver of Horror, 1965
Margaret Irwin, The Earlier Service
Mrs Oliphant, The Open Door
Saki, The Music on the Hill
F. Tannyson Jesse, The Canary
Ex-Private X, Smee
Ex-Private X, One Who Saw
William Younger, The Angelus
Theodore Dreisser, The Hand
M.R. James, The Treasure of Abbot Thomas
Bram Stoker, The Judge's House
Louis Golding, The Call of the Hand
Walter de la Mare, All Hallows
William Hope Hodgson, The Whistling Room
Charles Birkin, A right to Know
Dennis Wheatley, A Life for a Life
Cynthia Asquith, When Churchyards Yawn, 1963
Elizabeth Bowen, The Apple Tree
Hugh Walpole, A Little Ghost
L.P. Hartley, The Cotillon
Ann Bridge, The Buick Saloon
Algernon Blackwood, A Threefold Cord...
Arthur Machen, Opening the Door
Shane Lesley, As In a Dark Dimly
W.S. Morrison, The Horns of the Bull
William Gerhadi, The Man Who Came Back
Mrs Belloc Lowndes, The Unbolted Door
Oliver Onions, 'John Gladwin Days...'
Philip MacDonald, Our Feathered Friends
Cynthia Asquith, 'Dod Grante that She Lye Stille'
Arrow, 1965. Interesting supernatural novel by Harry Ludlum, who wrote a biography of Bram Stoker. Reprinted by Ash Tree a few years ago.