For your consideration, here is a Playmobil Geobra Plastic Shark Toy Figure, copyright 1998, with hinged jaw.  It has a little wear on it.  The mouth opens and closes fine.  It measures 6 1/8 inches long. 

It will be mailed in a box for protection.  Item pictured is the actual item up for sale and come from a non-smoking household.  (669.8b12c-.5bb)