A collection of Marilyn Monroe's "Lost Archives" including love letters, clothing, jewelry and glamour shots, some of which are expected to sell for at least $1 million, will go on auction next month. 

"We anticipate a lot of fans will be here. They'll fly in from all over the world," said auction owner Darren Julien to TIME.

Julien estimates that some pieces have the potential to sell for more than $1 million. Nine years ago a watercolor painting Monroe made with intentions to give to President John Kennedy sold for $80,000, The Associated Press reported. 

The collection to be auctioned on Dec. 5-6 includes 300 pieces from different points of the Hollywood sex symbol's life. 

"We anticipate a lot of fans will be here. They'll fly in from all over the world," Julien said to AP. Monroe's memoribilia will be on display in his Beverley Hills gallery four days before the auction begins. 

The "Lost Archives" collection was willed to Lee Strasberg, Monroe's mentor and a famous acting coach, when she died from a drug overdose at age 36 in 1962, reported AP. Strasberg left the collections in the hands of a trusted anonomyous friend who preserved the notes and other items in the collection. 

The love notes still look as if they are in the same condition as when the authors wrote them. 

"Please, if I've ever made you cry or made you even more sadder, ever for a second, please forgive me, my perfect girl. I love you," a pencil-scribbled P.S. at the bottom of a typewritten letter read from Monroe's third and final husband Arthur Miller. 

A framed letter is also part of the collection from costume designer Cecil Beaton reminding her that she is a great actress. Monroe kept that framed note on a coffee table in her home, reported AP.