Got this from a yard sale and now looking for the building instructions.
Definitely 75039-1: V-Wing Starfighter:
Instructions (2 different copies, US and EU):
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2The different versions are to support A4 or "US Letter" sizes - "Building instructions labeled "NA" or "V39" may be printed on US standard letter size paper, building instructions labeled "IN" or "V29" may be printed on EU standard A4 paper" - in this case 505 is the A4, while 506 is the letter size. – Zhaph - Ben Duguid♦ Feb 21 '17 at 15:52