the m43 and it's variants have the nice smooothly curved spine, without the abrupt knuckle bump most newer models have. more like the older fighting khukuris. the kamis end to make them a lot thicker and heavier than the original military m43s, but you can ask aunty for a thinner lighter version if you are willing to wait a bit.
p.s. - scandanavian knives do not have guards. at least not the ones for adults. they do make ones with guards for boy scouts or kids just starting to learn how to use a knife. someone asked why the adult knives do not have them, the answer was, if your hand slides down & gets cut you are using it wrong. many swords (langseax, shashka, langmessers and dhas, etc.) do not have guards. (oops forgot filipino bolos, barongs, and most others also do not have guards)