I just received a $5 bill signed by Kathyrn O'Hay Granahan and C. Douglas Dillon. It is 1953 C series and the serial number is C63204300A, which is written in red and the seal is also red. The top left corner has the letter K under the 5 and on the bottom left corner there is K13 before the 5. Any help would be greatly appreciated. I have tried looking on my own but everything I find doesn't have all the details, the signets may be different or the amount might be different.