SERIES 1977 $20 by COMPLEX BLOCKS Circulation production: AAcp BAcp CAcp DAcp EAcp FAcp GAcp HAcp IAcp JAcp KAcp LAcp BBcp CBcp DBcp EBcp GBcp JBcp KBcp LBcp BCcp ECcp GCcp LCcp BDcp GDcp BEcp BFcp A*cn B*cn C*cn D*cn E*cn F*cn G*cn H*cn I*cn J*cn K*cn L*cn A*cp B*cp C*cp D*cp E*cp F*cp G*cp H*cp I*cp J*cp K*cp L*cp Total: 28 regular + 24 star = 52. Special production: none. Grand total: 52 different, 52 overall.