Here is what the flag look like: http://www.dmna.state.ny.us/historic/btlflags/other/1-2-1Design.htm
This was the flag that BG.Kershaw wrote in his OR report at Fredericksburg.
Now the 1st Division was Hancock's. The second brigade was the Irish Brigade and the 1st Regiment...69th New York.
Have a good weekend, I am heading off to the LOC in a couple of hours.