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Hi Taz,
Beats me - the thin black line could be tape or paint. In the caption to photo #109 on page 74 of his book (for Dr.I 504/17), Alex Imrie states: "Note the thin dark-coloured spanwise stripes on wing leading-edges as a dividing line between the top surface camouflage and the light-blue under surface colours, a feature not seen on early production triplanes."
I just was pointing out that these leading edge 'stripes' are very apparent on the Lechelle photo, but not to apparent on the one available front 3/4 view of Greim's 521/17. At least, not to me.
Greg
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Greg VanWyngarden
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