Seems more Thai/Burmese to me. As you noted the collar in particular. The form isn't that much of a stress of the slightly curved dha bladed pole arms I've seen before from Thailand.
Here's a shot I found quickly on google of a bunch of Thai pole arms.
http://www.pbase.com/bmcmorrow/image/36570994/original
Blades aren't visible but some of them look rather straight and could fit the bill.
Overall I like the piece a lot, a pity these often have the shaft cut.