Dear Beverly,  The box you described was manufactured in Switzerland in
the latter half of the 19th century, after the 1876 Philadelphia
Exposition referred to on seals depicted on the tune sheet.  It was
probably made by Paillard in St. Croix.  These boxes typically had
genuine Rosewood veneer on the top surface of the lid, decorated with
sandalwood banding and often a central multicolored inlay.  The case
sides and front surfaces would be what I call "grained"; skillfully
painted to simulate real rosewood.  The 8p refers to the cylinder
length, as measured by 19th century Swiss craftsmen in "pouces".  8
pouces is approximately equivalent to 8-1/2 inches.

The advice I now extend is born of many years of experience with these
wonderful old treasures.  However well it may play for you, the box
deserves to have a thorough examination, cleaning and adjustment by an
experienced, qualified music box repairman.  I don't know your locale,
but I am in Georgia and do this work for about $60.  Neglected
maintenance will certainly result in jamming or a possible "run", in
which case the cylinder pins are flattened and bent up, and the comb
teeth are likewise mangled and broken.

Best of luck with your new (old) treasure.  Protect it well.

Reg Smith
Sublime Harmony Restorations
196 University Circle
Athens, GA  30605
706-543-2990