Maybe missing outer packing may have marks on cover
Silvine Duplicate Memo Book 102x127mm Pack of 12 603
Silvine Duplicate Book – Memo.
Manufactured from quality bank paper with laminated red covers.
Features include white pages numbered from 1 to 100 with an index sheet and carbon paper. Ruled feint. Size: 102x127mm (4×5). Ref: 603.
Carbon copying for precision results
Numbered between 1 and 100
Pages are ruled for neatness