Vigil Crest/Coat of arms links
Below is the link to a fairly good image of the crest on the Palacio de Vigil de Quinones,
This is a link to the page that a bit of historical data, you will need to google the page and translate it.
As to being the actual crest of the Vigil family I am afraid that I do not know enough of the back history of it. If anyone has authoritative data on I would be interested. I have seen a number of crests (coat of arms?) with the Vigil name attached so it's a fair assement that it is one of many. The gentleman who runs that "Vigil genealogy club" has a few coat of arms in his package but I haven't seen his name around the web for a while.