This is not a normal DDO. It is a Class III DDO where the 1949 date style (blunt top of 4) is hubbed over a 1948 date style (pointed top of 4). It may not have some of the characteristics typical of other classes of DDs.
Edit: See the varietyvista link I posted before. The only DDOs VV lists for this date are the Class III blunt over pointed 4.