SERIES 1981A $5 by BLOCKS

Circulation production:

 AA   BA   CA   DA   EA   FA   GA   HA   IA   JA   KA   LA
      BB                  FB   GB                       LB
      B*                                                L*

                                  Total: 16 regular + 2 star = 18.

Special production: none.

                            Grand total: 18 different, 18 overall.