The latest episode of the long-running series saw the experts return to Roundhay Park in Leeds where members of the public took their prized possessions to be valued.
One of those people was a woman called Stephanie who bought 300 bodybuilder magazines from the 1940s.
But it was another item contained in her collection that instead caught the attention of Clive Farahar.
Sorting through the publications, Clive explained it was actually a series of photographs of a young Arnold, now 76, and the Stephanie’s father, that had intrigued him.
Explaining their origin, she said: ‘My dad was born in India and moved to Kenya and then to England. His passion from being young was weight training.
Antiques Roadshow guest Stephanie held back tears after being told the value of some old photos (Picture: BBC)
‘He was a builder, but he always wanted to open his own gym, which he did in the seventies in Harrogate, the first one. And he first met Arnold at the age of 19 in London.’
She continued: ‘Arnold’s inspiration was a Leeds bodybuilder Reg Park, who made a film, Hercules. My dad called Arnold to do some seminars in 1981, to Leeds. He came to our house, Mum cooked.’
She showed one photo of her posing alongside Arnold with her mother and brother, as well as another Arnold had autographed for her.
She had first wanted a collection of 300 bodybuilding magazines to be valued (Picture: BBC)
The pair then spoke about other photographs from that time, including one of her father clenching his bicep as Arnold stood next to him.
When it came time for the valuation, Clive exclaimed: ‘That’s absolutely wonderful. Quite incredible. Well, how do I value this?’
‘You wanted me to value 300 bodybuilding magazines from the 1940s but I can’t and I’m not going to go there.
But it was some photos of her family with Arnold that caught the attention of expert Clive Farahar (Picture: BBC)
‘Instead, we’ve got these lovely personal photographs and you’ve got about four signed photographs of Arnold Schwarzenegger.
‘What am I going to put on it? Well, I think just this small private section of the collection, I’m going to put £2,000.’
She was eventually told they were worth around £2,000 (Picture: BBC)
He continued: ‘£2,000 for unknown photographs of Arnold Schwarzenegger. As far as I can see, all are absolutely private and early Arnold Schwarzenegger, too.’
Clearly shocked, Stephanie became emotional and started tearing up.
‘I’m very proud of my father for what he did and it’s good to share it with you. Something for Leeds.’
Clive added: ‘Thank you for sharing it with us, we love it.’
Antiques Roadshow airs Sundays at 7pm on BBC One.
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