Check the Places That Preserve Local History
Libraries, municipal archives, local museums, and historical societies often preserve school material that families have lost. Their collections may include yearbooks, anniversary publications, newspapers, sports-team pictures, and photographs of school plays, prize ceremonies, or final-year classes.
Search old local newspapers as well. Your standard class portrait may not have been printed, but another group photograph from the same year might show you and your classmates. Newspaper archives can sometimes be searched online by school name, teacher, event, or year. A librarian or archivist may know which collection is most likely to help.
The most efficient order is simple: search online, find former classmates, contact the school, trace the photographer, and then check public archives. Keep notes on where you have searched and whom you have contacted. Most importantly, do not give up after the first few attempts. Your photograph may no longer be in your own album, but another copy could still be sitting in a drawer, a forgotten box, or an archive—waiting for someone to recognise it.