silver | Silver Star | Horace Silver | Silver Spring, Maryland | Charlie and the Chocolate Factory | factory | Fear Factory | Silver Lake | Silver | Factory | Silver Spring | The Silver Chair | Silver Jews | Sheldon Silver | Willy Wonka & the Chocolate Factory | Silver Lake Partners | Silver Jubilee | Pokémon Gold and Silver | The Factory | Silver City | Silver City, New Mexico | Charlie and the Chocolate Factory (film) | C+C Music Factory | Silver Surfer | Silver Linings Playbook | Shout! Factory | Royal Ordnance Factory | Rolls-Royce Silver Ghost | Queen Elizabeth II Silver Jubilee Medal | ''Pokémon Gold'' and ''Silver'' |
Herko was associated with a group of habitués to Warhol’s Silver Factory on 47th Street including Ondine, Rotten Rita, and Billy Name.
In 1941 he studied metalsmith at Goldsmith's school in Helsinki, and later at the Georg Jensen silver factory in Copenhagen.