GUEST: I brought a watch which we believe is an Omega watch.

I found it, um, on the side of a road in a free box.

And my husband was complaining that we were stopping at a free box and we'd been yard sale-ing, and I kind of threw it at him jokingly, like, "Here's a watch.

Thinking it would be a, you know, a fake watch, because I couldn't fathom anybody putting out a watch, um, on the side of the road.

Yeah, and we've had it since, it's been about a year-and-a-half, and my husband believes it's real, and we're here to find out what it is.

APPRAISER: It's an Omega Seamaster 300.

"300" is for 300 meters, which is indicated right there on the dial.

That's 980 feet.

And this one dates early 1960s to mid-1960s.

It was marketed and sold as a diver's watch.

It's a little bit larger than what you think most wristwatches would be, because it would have to fit over a wetsuit.

So originally it would have come with a metal bracelet.

Perhaps it came with some kind of a nylon or rubber strap that could be adjusted for size, because the wetsuits can get quite big.

It's a 552 caliber automatic winding movement, which means with the movement of your wrist, it winds itself, it keeps running perpetually.

GUEST: Okay.

APPRAISER: You don't have to sit and wind it up.

You notice the large black rotating bezel?

That rotates because the divers have to know exactly how much time they have underwater.

GUEST: Oh.

APPRAISER: So this is a very important instrument and tool of diving.

Omega refined the diving watch.

They were one of the best because this could save your life.

You'll notice the face is a nice matte black finish with luminous numerals and hands.

Glow in the dark underwater.

In the world of collecting right now, in the world of value, this watch, you don't want to clean it, you don't want to touch it.

In terms of desirability, this is way up on the list.

Watch collecting world, right now, would fight for this, they're very coveted.

Retail, this watch right now will bring $8,000 to $10,000.

GUEST: Okay.

All right.

(laughing): That's amazing.

(chuckling): Not bad for picking it up on the side of the street, I think.