Thank you for the "encouragement", Carl and thank you for the info on the markings, Don! The lozenge patterns (the underside of the fuselage is in a lighter palette) seem to fall within the range of the half dozen or so that I have seen over the years.
Update - Aircraft 002 (ex-Fok. E.V 183/18) was assigned to Cpt. Stefan Bastyr based on an illustration found
here The MM model text appears to assign Stefan Stec to Aircraft 001 (ex-Fok. E.V 180/18). His aircraft is illustrated in three different schemes on the Russian
Wings Palette site. These two show the "lazy S" rather than the "infinity" symbol but are identified as ex-185/18.
(looks like the illustration from the Marek model)
While this one is ex-187/18 in a somewhat different scheme:
So - Stec? Bastyr? 001? 002? Olive upper wing surface or lozenge? Olive underwing surface or light blue? Ain't WWI-vintage aircraft fun?