This is 1904 sheet music. Copywrite by A. Durand & Fils in Paris. The title is "A Children's Corner". It was composed and signed by Claude Debussy. I've seen unsigned copies selling for $19.95. Will the signature increase its value? To What amount?

The sheet music is used and in good condition. 1" tear at bottom of binding and nick taken out of the front page near signature and date.

This is a mug made by the Frank Beardmore Company. It is an English Staffordshire pottery piece. I would like to know the estimated value of this mug. 

A set of vintage english fine china- large plates, side plates, saucers, cups, small bowls and large bowls. Glazed with permanent and acid resist colours, a genuine hand engraving. The set is called Ironstone Olde Country Castles made by Hostess Tableware in England. Please provide an appraisal of all pieces in the set individually as well as the whole set.

Robert Morris Patriot 13 cent unused prepaid postcard USPS 1981 (quantity 100)

Cedar chest from the 1930s.or earlier. Unknown maker. Caster wheels. Jewelry box inside. 

There are more photos I just am not where they are at the moment and am just curious if what their value is