This is in pretty rough shape but I believe the 2nd letter is a D, maybe CD.
The left side has 3 sizes and the right 2 sizes.
Anyone recognize it?
(http://imageshack.us/a/img9/7358/vu7c.jpg)
(http://imageshack.us/a/img6/8285/igvk.jpg)
(http://imageshack.us/a/img708/5664/q6p7.jpg)
ND - Not Desirable, send it to me ;P
(Reminds me of a windmill wrench..??)
G1 which is an Oliver Chilled Plow wrench (see Rathbone Volume One Page 361).
Also used on IHC (Rathbone vol 1 page 253). Irps shows sulky plow usage. The G1 is not very distinct on the two I have. Heres photo of one of them.
I done a 180 flip on mine and can see where it may say G1.