The Hollywood star, who died aged 36 in 1962 after overdosing on barbiturates, is buried in a crypt in Westwood Memorial Park Cemetery in Los Angeles, California.

As a result the sign marking her burial place is accessible to fans and tourists, whose kisses and touches have oxidised the bronze sign marking her burial place.

Due to wear and tear the plaque is often replaced, with the sign regularly being put up for auction since the early 1990s.

Bidding for the bronze marker, which reads "Marilyn Monroe, 1926 – 1962," on one side and ''Make Two Patterns for Marge'' on the other, starts at $50,000 at Nate D. Sanders auction house in Los Angeles.

"Make two patterns for Marge", refers to Marge, the production supervisor who set the lettering on the marker.

The grave marker is on sale online until Thursday (17Nov16).

But the bronze memorial is not the only piece of Marilyn memorabilia going on sale this week (end20Nov16) as another Los Angeles auction house, Julien's Auctions, is also hosting of keepsakes from the Some Like It Hot star's career.

Bidders will also be able to get their hands on the dress Marilyn wore to sing Happy Birthday to U.S. President John F. Kennedy, but it is likely to sell for more than $3.3 million (£2.7 million).