This watch is a bankroll-ex.

An Air Force veteran appearing in a segment on “Antique Roadshow” probably thought he’d get a few hundred bucks for a watch he bought for $345.97 in 1974. However, its actual value quite literally floored the flabbergasted flyboy.

“A watch like this, at auction, is worth about $400,000,” said appraiser Peter Planes, prompting the man, known as David, to theatrically collapse to the ground. And if that wasn’t enough, David’s particular timepiece could fetch between $500,000 and $700,000, according to the PBS show expert.

Planes noted that David’s particular Rolex Oyster Cosmograph bore similarities to a watch Paul Newman wore in the 1969 movie “Winning,” which was valued at around $150,000. However, the vet’s timepiece was even more unique due to its water-resistant screw-down buttons, and the fact that it was “in perfect condition,” according to Planes.

It was a story of fatigues to riches. David had purchased the precious Rolex while stationed in Thailand as a bomb disposal technician in the early 1970s. He was reportedly inspired by the flashy Rolex-toting pilots of the former Continental and Air America airlines, and he also wanted a waterproof timepiece for scuba diving. However, due to the model’s exorbitant price, he had never bought one before.

“I always wanted to purchase one, but they were very expensive,” laments the Air Force vet.

He eventually caved and ordered the watch in November 1974 for $345.97 — the equivalent of about a month’s salary at the time, according to David. He even got a 10 percent discount.

The veteran then tucked the timepiece away in a safety deposit box for between 30 and 40 years, he said, claiming he only took it out “two or three times to look at it” before bringing it to the “Antiques Roadshow” taping in North Dakota. He had handled the Rolex so little that a foil sticker listing the reference number on the back hadn’t even worn off.

It was a good thing he hadn’t. “In this condition, I don’t think there’s a better one in the world,” said Planes of David’s unorthodox lotto ticket.

More importantly, the watch punched David’s ticket to riches. “Half a million dollars, $700,000 — that’s life-changing for somebody,” David told the Washington Post. Even the blank warranty forms that came with the watch could fetch up to $2,000, according to Planes.

However, the lucky vet must make sure to leave the Rolex untouched.

“You can’t wear it though; if you wear it, it drops down to the $400,000 value,” said Planes.