 Harrys glasses frames were dark brown, contrary to the widely held  view that they were black. They were a style called "Teviot 74"  manufactured by a company called UK Optical. They were already  popular at the time for being a stylish and inexpensive alternative  to the standard models that were issued for free by the National  Health Service in Britain. They became even more popular after the  success of this film. Len Deighton (qv) wore the same frames at  this time. Those frames have been described by some as the first  affordable "designer" frames available in the UK.