Scrimshawed whale tooth

Summary: 
Scrimshawed whale tooth with warships and inscription "The Merrimac and the Monitor exchange fire".
Description: 

Scrimshawed whale tooth with battle scene of 2 steamer ships with inscription "The Merrimac and The Monitor exchange fire".  Ship with sails in the distance.  Scene is surrounded by ribboned and striped border.  On underside of tooth, etching of 3 cannons surrounded by tied ribbons.