Due Diligence on a vintage watch

[sda619]

Hi I just bought a watch off a vintage estate jeweler.

What is the best way to look up the serial number to make sure it's not stolen or dubious.

Besides authentication what else should I do to make sure the watch is on the up and up?

I have bought vintage rolexes before but only from more mainstream dealers. I wanted a birth watch and was having trouble finding it. Of course it doesnt help that I wait till the last minute for my wifes birthday.

Its a 16013. If that matters.