SERIES 1981 $20 by BLOCKS

Circulation production:

 AA   BA   CA   DA   EA   FA   GA   HA   IA   JA   KA   LA
 AB   BB   CB   DB   EB   FB   GB   HB   IB   JB   KB   LB
 AC   BC             EC        GC             JC        LC
      BD             ED        GD                       LD
      BE                                                LE
      BF
 A*   B*   C*   D*   E*   F*   G*   H*   I*   J*   K*   L*

                                 Total: 37 regular + 12 star = 49.

Special production: none.

                            Grand total: 49 different, 49 overall.