The 1981-s SBA Dollar is the third lowest mintage in the SBA circulation strike series! Only the 1981-p and D have a lower mintage, however the San Francisco strike may be very hard to obtain in high grades!
In 66 they are considered scarce with only a couple hundred examples of this grade!
While 67 seems almost unobtainable with only 5 graded higher than 66 at PCGS!