Puff:
Mak is a term used by some of the Montagnard tribes to describe the axe they use in agriculture and presumably for a weapon.
The markings on the blade of this one are consistent with those of some of the groups in northern Thailand/Laos/Vietnam.
There was a discussion of mak on the previous EEWRS Forum and a nice picture posted of Montagnard weapons that appeared in a National Geographic. Here is the thread:
http://www.vikingsword.com/ubb/Forum1/HTML/002010.html And here is the picture from National Geographic.
Ian.