The orginal regimental flag was destroyed during WWII but Gherdi Davis prepared a detailed plate of the flag from an earlier drawing and provides the following description.
"A white St. Andrew's cross, each arm bearing two golden fleur-de-lys. A crown in the center of the cross. The upper and lower triangles striped in with six white and five red verticle wavey striped. The right and left-hand triangles with six white and five blue horizontal wavey stripes.
"The arms of the Duke of Deuxponts are placed on this flag, but in a very unusual manner, mainly: they are separated into four arms each with a mantling. The triangle next to the staff and the opposite triangle are charged with the following arms: per pale, the Palatinate and Bavaria. The upper triangle bears the: per pale Velsenz and Hohnstein; the lower triangle bears per pale Rappolstein and Hohenack. The mantlings are blue, the dexter side charged with the arms of hohnstein and Hohenack, a not very common but very artistic method of drawing the mantlings. The plate is a very accurate copy of Mr. Hollander's drawing: the latter being on tracing paper could not be used for the purpose of making the plate.
The Arms appear in the upper row 3-4-1-2 and 4-3-6-5 in the lower.