I can't contribute to the St. Mihiel info but just to add some potential confusion and food for thought...
Seefrosta unit was based near the coast at Nieuwmunster and later (just before the armistice) Vlissighem and flew scouts and reconnaissance land-based aircraft (Halberstadt CL.II and Rumpler C.IV types) in support of naval aviators of Zeebrugge and Ostend. This Albatros D.Va. had a "rising sun" marking but pilot and plane number are unknown. There is a photo of it at Vlissighem which would mean after August 5, 1918.
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