Hi Jazz, first of all welcome to the forum
Second let me say that i'm completly ignorant on moro arms, but I love them and I'm trying to learn more about them
If I remember right Cato, in his book, says that the older blade are characterized by a line of separation from gangya and blade that is almost horizontal. In the other hand late 19th century and early 20th century blades shows a line with a degree of 45°, like yours. More, even if the blade rapresents the naga (with beautiful scales on your piece) it's not unusual to find serpetine blades with cacatooa handle. Anyway I will be happy to find such a nice kris also for twice the price you have paid !!!