...and thanks for posting my two in post 13, saves me the trouble. the curved one has a blade thickness very close to the straight one and is very sharp.
i'd say a 'flyssa' is any blade made and decorated in traditional tribal designs and materials by the ifllissen peoples of north west africa. normally charicterised by decorative brass covering on hilts and traditional geometric engravings and brass inlays on the blade, with distinctive and traditional geometric patterned carved wood scabbards.
grip, blade, scabbard. all iflissen = flyssa - whatever shape.
nimcha grip, blade, iflissen scabbard= nimcha with an iflissen scabbard
nimcha with an iflissan blade and generic european style scabbard is a nimcha with a flyssa blade.
and so on ad nauseum.