I'm guessing they just used things that they had around, they easily could have compared it to this http://www.amazon.com/Seiko-SKS399-Stainless-Steel-Watch/dp/

I'm guessing they just used things that they had around, they easily could have compared it to this http://www.amazon.com/Seiko-SKS399-Stainless-Steel-Watch/dp/B00GX7N6OQ/ http://www.amazon.com/Seiko-SKS399-Stainless-Steel-Watch/dp/... which is < $100