Tom , I have no experience with shandigan barungs not having one in my collection nor even seen one in real life .
Here's what I can tell you about my 'regular' barung ; the blade is slightly wedge shaped (very slightly) in cross section . The sides or flanks if you will are flat except for the lumpiness from the smith's forging . The blade does not swell out toward the edge in cross section and the edge is a convex curve to its apex .
One last picture :
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