Quistorp, Barthold von (1825-1913). Die Kaiserlich Russisch-Deutsche Legion: ein Beitrag zur Preußischen Armee-Geschichte; (mit 1 Kt. und 2 Pl.) / von Barthold von Quistorp. Berlin: Heymann, 1860. xx, 343 p., map; 8vo.

A former discussion of possible interest re the Legion here on the NSF:

http://www.napoleon-series.org/cgi-bin/forum/archive2004_config.pl?md=read;id=26499;page=53

I will view a Russian source for possible information about standards:

Pokhod russkoi armii protiv Napoleona v 1813 g. i osvobozhdenie Germanii: sbornik dokumentov
By Rozaliia Efimovna Alʹtshuller, Liubomir Grigorʹevich Beskrovnyi, Institut istorii (Akademiia nauk SSSR), TSentralʹnyi gosu darstvennyi voenno-istoricheskii arkhiv SSSR (1964). 537 page. This vol has a section of Russian documents (pp 431-445) concerning the formation of the Legion.

as well as Zweguintzow's two vols on Russian flags, and report any information found on the subject.

Steve