Over 300 items from the screen legend’s Beverly Hills home will be auctioned by Christie’s on June 30 and are expected to fetch more than $1 million (€0.83m).
To stroll around the display is like poking through Brando’s own private life.
Everyday items such as old credit cards, driving licences and a chess set sit by mementoes from an illustrious Hollywood career.
The treasure trove includes a 1972 Godfather script, covered in notes revealing how he created his classic Don Corleone.
A letter from Mario Puzo, written shortly after The Godfather was published, reading: “I think you’re the only actor who can play the Godfather”, could go for up to $1,200 (€1,000).
A flick through any one of hundreds of books reveals Brando as a keen note-taker and doodler. Personal thoughts are scrawled in the margins and words underlined or circled.
Other memorabilia includes Brando’s school yearbooks and summer camp medals and letters from legends such as Jack Kerouac, Francis Ford Coppola and Martin Luther King.
Other lots include his 1954 Oscar nomination for On the Waterfront - Brando’s first Academy Award - and the Bafta he won in 1953 for his Marc Antony in Julius Caesar.
The property was hoarded from the earliest days of his career until his death last July, aged 80.