I was recently going through my grandpas old things and I came across an old revolver. It has "RED JACKET No. 3" and the top of the barrel and "9931" on the bottom. After doing some research I discovered it was made between 1875-1885 by Lee Arms Company. The reason I am looking for more info is because in all the pictures I've seen, the guns have a 5 digit serial number and it is always stamped in a straight line. The numbers on this gun are very off center and there are only 4 digits. Could this have just been a production error or something different? Any info is greatly appreciated!