Is this a THAI or BURMESE Shield?

[CharlesS]

Almost certainly 19th Century, I thought at first this was wood, but now believed it is carefully shaped hide that has been heavily lacquered and painted. The rear is reinforced with a hardwood rib which also serves as the handle.

But....is it Thai or Burmese???...and what characteristics would define it as such???

Thanks in advance for any input.