So I took my watch In there to get looked at not t...

So I took my watch In there to get looked at not to sell just wanted to know more about it the old guy told me it was worth like 400 nothing special
He then said he'd buy it for 400 turns out it's worth 2500 even if it didn't work and that is rare I got it from my granddad after he passed and wouldn't have sold it even if he'd have told me more money but I left knowing nothing more then when I came in and now the second's hand isn't moving after he opened it to look at