A BBC Antiques Roadshow guest exposed hidden detail in everyday items that not many people may know about.

The late Queen Elizabeth's side profile on the original 1967 postage stamp is one of the most recognised images of all time but it has been revealed that they're not her shoulders.

During Sunday's (April 19) episode of Antiques Roadshow, the show aired a royal special to mark 100 years since the birth of the Queen.

Filmed at Windsor Castle, viewers got a peek inside the Royal Collection, which included personal items and cherished mementoes.

However there is one detail about an item that may surprise viewers. Since the time of Queen Victoria, the monarch's head has appeared on stamps and when Elizabeth became Queen it was time for a royal refresh of stamps and currency.

But there was a set of stamps produced in 1967 that became the most iconic. Antiques Roadshow expert Alexander Gill met two sisters, who shared a secret about their mother, Angela Hewins, and her connection to the design.

Artist Arnold Machin got the commission to produce the new stamp in 1967 and at the time the first design stopped at the neck, but the Palace said they wanted her shoulders in it too.

But rather than make her sit for it again, Angela, a family friend, stepped in and agreed for her shoulders to be used for the iconic portrait. She modelled at her mum's house with a pair of old curtains round her shoulders.

One of her daughters explained: "The first design that he did was of the Queen's head, stopping at the neck and the feedback from the Palace was that they wanted some shoulders, as well."

She continued: "Obviously Queens are busy people and anybody's shoulders would have done and mum was available. So the shoulders of the Queen on the stamp are actually the shoulders of our mother."

Alexander jumped in: "That's absolutely fantastic, isn't it. In the stamp she's got a kind of dress, just on the corners of her shoulders doesn't she."

Angela's daughter replied: "Yes, so my mother modelled at my grandmother's house and she produced a pair of old curtains and Arnold draped them around her shoulders."

Pointing at the stamp, Alexander said: "And what we see here is a final product. Machin was from Stoke-On-Trent and he worked for Crown Derby and he worked for Minton and he also worked for Wedgwood."

She continued: "I can see a wonderful correlation here between the Wedgwood cameos and the image that we have here."

You can catch Antiques Roadshow on BBC iPlayer