This is an Italian Switchblade Automatic Knife with a Blond Horn handle that is overall open length 11 inches with a 5.0" Bayonet Blade. It weighs in at an average of 4.0 ounces and is made by Renzo Piscato of Maniago, Italy. It is a button open switchblade knife and closes with a swivel release of the top bolster then by pushing down on the blade to close. Handle coloring may vary from the picture. Follow this link to see instruction on how to close:
How to open close Italian Stiletto Switchblade Knife video by Horizon Bladeworks.