I do not know the history of this dress .  I think it is costume and not true vintage.  It looks clean but does have some water rings on it which show in certian lights...but the fabric is so full and with a sheen that when it is on the dressform there are no noticable marks.  The last picture is of the collar which has a hole in it.  Their is a bow on the back waist that could be used as fabric to replace the collar if the dress was to be used as a real wedding gown.