What's it Worth?

From the seller:

A stunning 1870’s dress from the famous Paris fashion house of Charles Frederick Worth. The dress has recently been de-accessioned from a museum collection. The cataloging tag is stitched inside the bodice. Please note that the dress has seen later period alterations on the bodice front and skirt. Included with the dress are a large piece of fabric and a separate bow. The satin fabric has a black and gray stripe pattern. The neckline on the bodice has a net lace insert. The bodice is lined with cotton and has a hidden front button closure. The bodice has a long back peplum that is trimmed with a large bow. The skirt is unlined. The dress is in good condition. There is a ½ split on one shoulder and some stress wear on the sleeves and shoulder area of the bodice. Bust 34 Waist 26 Front skirt length 40 Back length 49. The extra piece of fabric is 49 inches long and 23 inches wide and might have been removed from the back of the skirt.

From Me:

What would a day of exceptional pieces be without a dress from the house of Worth?