A grandad was shocked to discover that a watch he picked up for just £45 ($57) is actually worth more than £30,000 ($38,000).
That's a decent mark up, by anyone's standards.
71-year-old Roger Cooper was visibly flabbergasted when he was told the news on BBC's Antiques Roadshow.
He bought the Omega Speedmaster 'Ultraman' in Hong Kong 51 years ago when he was in the Merchant Navy, but now has discovered that it has increased dramatically in value.
It is thought that only 50 of these watches were created in 1968, so it's pretty damn rare. The 'Ultraman' nickname comes from the 1971 Japanese TV series 'The Return of the Ultraman'.
Mr Cooper, from Hampshire, spent nearly a whole month's wage buying the timepiece, but you can bet he's pretty glad that he did now.
He said: "I was in Hong Kong and became friendly with a guy who knew a wholesaler who I could get a good price on a nice watch from for my 21st birthday.
"I spent £45 on it, which considering my weekly wage was £10, was quite a lot, but I'm very glad I held on to it for all these years now.
"I wore it while sailing dinghies until about 1983 so it did get bashed about a bit. I decided then to switch it for a cheap Casio and tuck the Speedmaster away safely in a drawer."
"I would sometimes glance through the windows of watch shops to look at Speedmasters and over time I realised the ones on sale were slightly different to mine.
"Last year, I finally did a bit of research and found out its red hand is very rare, which prompted me to write in to Antiques Roadshow about it.
"I didn't expect to hear anything back but they were interested and we filmed the piece. I was stunned to find out how valuable it was.
"I could have kept hold of it as an heirloom but it is so expensive to insure I decided to sell it so I can treat my family."
He eventually put the watch under the hammer at auction house Gardiner Houlgate. In the end, it fetched £31,000 ($41,000).
Not too shabby, eh?
The auctioneer, David Hare, said: "The Ultraman is an extremely rare version of the more common Speedmaster made famous by Neil Armstrong wearing one on the Moon.
"The only difference is that it has a very rare red/orange second hand and was made in limited numbers only in 1968.
"The Ultraman featured in a Japanese TV series a few years later, which is how it has come to be known by this name.
"These watches are extremely scarce and I only know of a couple of examples which have been sold at auction in recent years."
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