Hey John,
Looking at the black-line in the photo seems to me as photographic touch-up. This was so done because the demarcation between the structure and the background or structure on structure details blended together.
I wonder if this effort of Aviatik was to compete with Fokker and other manufactures to produce a simple, low cost, fast an agile front line fighter?
Nice cowling by the way.
WF2
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