The male guest carried two extra straps and an invoice along with his late dad’s Rolex replica which he purchased for £132 in 1972.
The guest said: “He bought it for himself in 1972, when I was seven and me, my mum, my dad and my brother went to Birmingham to buy it.”
He was left speechless as expert Richard Price told him the watch was worth around the £20,000 mark.
With shock written all over his face, he turned to his family and said: “It means absolutely everything to me, it’s part of my dad. Very, very special watch that is, and it will be forever.”
Richard said the straps alone are worth a “chunk of money”.
His late dad gave the Swiss movement Rolex Submariner copy watch to him months before he passed away.
The guest noted: “My dad, he loved this programme and he would have loved to see his watch on here but he wouldn’t have cared what it was worth.”
Fans took to Twitter to share their emotional reactions.One said: “The emotion of the guy knowing how much his late father’s steel fake Rolex Submariner is worth and his son’s face seeing his dad react like that is proper #antiquesroadshow.”
A second wrote: “Wow. That man only just did not cry. But £20k for a 50-year-old watch… pretty amazing!”
Another said: “Dad over the moon with the watch valuation.”
Richard explained: “Within that 10 year period this watch was made with six different types of dial but the important thing to see is that yours has feet first.”