3.360 stamps were overprinted all coming from the left column panes. 1.015 were sold as remainders. From the quantity printed it is evident that 168 sheets were used to accumulate the right number of stamps from only the left column panes with stamps with check letter “D” having a right wing margin unless the stamps were re-perforated.
The 6 d plate 16 stamp was used for the overprinting. The sheet layout was 12 panes (4 rows of 3) of 20 stamps each in 5 rows by 4 columns. The adjacent plan shows the complete sheet design as issued for the 20th March 1874 Great Britain stamps. The blue shade indicates the panes that were used for the overprint. Thus the possible check letters bearing the overprint are AA to TS.