http://www.lincolncentresource.com/OMMS/1956womm1.html Can you find anything on the D that resembles this? This is the closest example that looks like the D in the picture you took, your picture wasnt close enough so i cant tell if there is something sticking out on the OUTSIDE of the ROUND PART in the D. Should look like there is an S there. If there is, its OMM
