Burt Lancaster has top billing in this film, but the plot, character and whole movie belong to Edmund Gwenn - "Mister 880." Gwenn had won the Oscar for best supporting actor in "Miracle on 34th Street" of 1947, and was nominated again for his role in this film. While he didn't win the Oscar in 1951, he did win another Golden Globe as best supporting actor, which he had also won for "Miracle" in 1947.
Gwenn's role of William "Skipper" Miller here is based on a real person, Emerich Juettner. And the movie is based on the true story of Juettner's 10 years of counterfeiting one-dollar bills, and his final discovery and prosecution. The film is based on the story written about Juettner by St. Clair McKelway and serialized in The New Yorker magazine in 1949, and later published as a book. The story is fairly accurate - Mister 880 was the file number that the Secret Service assigned for this unknown counterfeiter. Skipper's character had emigrated to the U. S. from Austria where he was born, in 1876.
The movie is centered around Burt Lancaster's role as Steve Buchanan, the Secret Service agent who handled the investigation of Mister 880. But, the real Skipper didn't get caught as in the film. The authorities in real life hadn't been able to narrow down their search as the movies tells it, and get close to discovering who the counterfeiter was. Rather, Mister 880 was discovered after he had destroyed the plates and thrown his printing press out during the winter. And some boys found several of the bogus bills, showed them to their parents who then reported the find to the authorities.
As in the film, Mister 880 was given the sentence of 1 year and one day and a $1 fine; and he was paroled after serving 4 months. That was in 1949, and he was 73 years old. On his release, he lived five more years, dying at age 79 on Jan. 4, 1955. But in real life, Mister 880 married in 1902 at age 26. His wife had a son in 1903 and a daughter in 1918. She died shortly thereafter of the Spanish Flu. The movie doesn't account for Juettner's family. The Wikipedia bio doesn't have information about Juettner having served in the U. S. Navy, as the film conveys.
By casting Lancaster and Dorothy McGuire in leads and building a romance around them, 20th Century Fox was able to craft a story with enough interest and star appeal to draw fans and make a movie pay off. The character of Skipper probably was the kindly old gent as portrayed by Gwenn. The bio says that he fessed up to what he had done, as the movie shows. One would like to think that human interest stories such as this would be able to stand on their own. But, one has to trust Hollywood somewhat based on the experiences of long-time professionals working there. Even though they at times misjudged films - big budget films that flop at the box office. And then, there have been the little regarded sleepers that turn out to be blockbusters - such as maybe the biggest one of them all, "Casablanca" of 1942.
So, this is still a very good story; a nice little romance and light comedy, and gentle drama about a kindly old man who broke the law to survive, but doing it in a way that no one would be terribly hurt. And, the supporting role, played superbly by Edmund Gwenn, is what really makes the movie rather than any of the Hollywood revisions and add-ons to sell the movie.
