Clark Gable, William Powell. Charlie Chaplin was cute. Douglas Fairbanks junior. Stewart Granger.
Raymond Massey didn't look great, but I liked him as Black Michael in "The Prisoner of Zenda". He looked a more menacing villain than most who played upper class villains.
Lauren Bacall, Myrna Loy, Jean Harlow, Rosalind Russell, Lucille Ball (She looked classy in her movies). Betty Grable was cute. Marilyn Monroe was cute too in most of her roles. Mary Pickford. Norma Shearer. Vivien Leigh.
During the golden years of Hollywood I would say that Errol Flynn, Clarke Gable, Stewart Granger, Rock Hudson were a few of the best looking actors. For the actresses, Elizabeth Taylor, Debbie Reynolds, Jane Russell, Marilyn Monroe, Lauren Bacall.