CNN  — 

A man brought a Rolex watch he purchased in 1974 for $345.97 to an antiques show to find out its current value. His reaction: priceless.

Told a watch like his is now worth $400,000 at auction, the man toppled to the ground.

But the appraiser wasn’t finished. Because of the watch’s pristine condition, the watch was valued at between $500,000 and $700,000.

The man appeared on the PBS series “Antiques Roadshow” with his unworn Rolex Oyster Cosmograph Reference No. 6263 in hopes of learning its value.

The show travels across the country “in search of America’s hidden treasures.” During Monday night’s episode, which featured the man and his Rolex, the show was at Bonanzaville in Fargo, North Dakota.

The man, a US Air Force veteran, said he purchased the Rolex because he heard it was a good brand for scuba diving. He said he ordered it through the Air Force base exchange in November 1974 and said it arrived in April 1975.

But after he received the watch, which cost nearly a month’s salary at the time even with a 10% discount, he decided it was “too nice” to take into saltwater.

The Rolex Oyster Cosmograph was made  in 1971.