Dr. Terrence Barrow, an authority and accomplished author on South Pacific cultural items, identified this piece as an Asmat bowl.  This gallery concurs with that appraisal and believes it to be a late 19th century work.  This bowl is in very good condition.  There is a superficial crack on the underside which does not go all the way through.  It also has a carving on either side of confronting snakes.