The Missouri State Museum collection includes the National flag of Sigel's 3rd Regiment Infantry Missouri Volunteers (3 Month Service). Their website does not mention, however, that this flag was lost.

The 3rd Missouri also was presented with a flag by the German-American community of St. Louis on 8 May 1861. The flag was stitched in double silk and was embroidered with the inscription III. REGIMENT / MISSOURI VOLUNTEERS / LYON’S FAHNENWACHT (David Hinze, Karen Farnham, The Battle of Carthage: Border War in Southeast Missouri, July 5, 1861, (1997) pp. 66, 255 n. 18).

The regiment also is said to have had a red flag with a depiction of a hammer smashing some chains. This is according to Wolfgang Hochbruck (American Studies, U. of Stuttgart/Germany) who is cited in Tony Horwitz, Confederates in the Attic, (1998) p.186. (One can come across flag references in the strangest places).