AMHERST, N.H. (WHDH) -- A previously unseen photo of Princess Diana will hit the auction block in New Hampshire, which could fetch up to a $1 million bid.

The photo features the then Diana Spencer reclining next to an unidentified young man. He is gently resting a book on her shoulders. There is a bottle of whiskey on the window ledge. Diana is 18 or 19 years old in the photo.

The photograph came from the Caren Archive after it was purchased seven years ago from the British tabloid The Daily Mirror.

The rare photo was never supposed to be published, as an editor with The Daily Mirror boldly noted on the picture, writing “Not to be published.” It’s believed to have been taken a year or so before Diana was engaged to Prince Charles.

The paper obtained it two days after the royal couple announced their 1981 engagement, but for some reason never ran the photo. There is speculation that the liquor bottle in the background and the mystery man she’s lounging with may have caused a stir.

RR Auction in New Hampshire said the photo is tantalizing for collectors.

“Diana is so iconic and so collectible and our clients love Diana,” said Bobby Livingston of RR Auction. “Here’s an image that’s never been seen, never been published and has this incredible marking on it…why it hasn’t been published and it’s a mystery -- we don’t even know who’s in the picture. I think if you’re a Diana collector, yeah, it’s a one-of-a-kind item.”

The auction house is also selling other Diana photographs -- one take in 1988 showing the princess, ironically, at a marriage conflict resolution conference.

“History tells us at this very moment when she’s attending this conference her own marriage, it’s falling apart and you can kind of -- photography is one of those great things that captures the moment and if you look at her, how sad,” said Livingston.

These photos, other royal family Christmas card photographs, and original pictures of the Beatles, Charles Darwin and Albert Einstein, among others, will all be put up for auction online.

“We expect [the Diana photo] to go for much higher. Interest in it is intense. We’ve seen registrations from all over the world for it, so really the sky’s the limit on where it could go,” said Livingston.

RR auction said the opening bid for the photo starts at $200.

For information on the auction click here.