I would guess kyat is likely to refer to the weight of the sword ( I'm not overly familiar with Burmese measurements but I think it refers to density more specifically than mass ) .
Here is a picture of the spine showing the regular lines :
It looks like some of the brass and copper have fallen out . There are identical diagonal lines on the steel where there is no brass . Is this to allow purchase for the brass or a deliberate pattern and therefore a deliberate random variation in the design ?