Since gold demo's where only Jan(A) Feb(B) and March(C) your tractor may be one. Post the serial numbers to confirm. If it is a gold demo your tractor would have looked like this when it left the factory;
Kirk
Here's another view of the transmission stamp. The SN, I think, is underneath where it says 881 (the model). I think it says 89105. It's kind of faint.