I am painting some miniatures for a table top wargame, and have an element of Civil War period Marines, including a color bearer. I can find a written description of the correct flag, but not a plate or photograph. Is there a color image somewhere that you are familiar with of this era flag? In case there is any difference among Marine units of the period, this Union Marine element is to be part of the garrison of the Norfolk naval base. I also offer that if anyone is interested in getting these figures, http://www.brigadegames.com/ makes and sells them. They are the only source for this 28mm tall set of figures. I'm a retired Army NCO, and my son is currently serving in submarine duty out of Norfolk. We appreciate any assistance you can offer on this.
It sounds like a naval jack to me, if my memory serves me right the USN had many different styled ones. The one I use is a 36 star banner with a blue field. It is probably more of a patioric flag, with the 13 stars, etc.