Go to a website called Photobucket, and post your pictures there.
Then insert the links to your pictures into your text on this forum.
Picture all markings, as well as general pictures of the piece.
I hope that you realize that this might be a Spanish copy of a S&W gun.
If it's a real S&W pistol, a letter to S&W (plus a payment) will give you the date of manufacture, and a bit of sales and shipment history.