I believe your half dollar would be the 66 SMS DDO-009 in the CONECA Master Listings. I can see several markers in your photos that match the DDO-009 in my collection, see photos below. Two parallel die scratches north-south left of last 6 in date, die scratch south of middle of nostril, small die gouge south of beak of the 1 in date, and small gouge left of the lower G of GOD.
Larry Nienaber





Larry Nienaber
































