The present invention relates to method and an apparatus for sequential printing of characters. The apparatus is a numbering box with a plurality of numbering wheels viz., unit wheel, tenth wheel, 100 wheel, 1000 wheel, 10000 wheel and 100000 wheel, which are provided with a combination of ratchet and groove profiles on side-surfaces, numbers engraved on the periphery and are operably interconnected. The 100 and 1000 wheels provided with a combination of uniquely designed multiple grooves and ratchets. The numbering boxes are arranged in the form of a matrix of maximum rows (mr) and maximum columns (mc), to print first sheet. Thereafter, printing of characters on the second sheet till the next 99 sheets occurs. Finally printing from 101 sheet onwards till desired number of sheets is performed after assigning suitable value to first numbering box of 101 sheet by using the character profile of 100 and 1000 wheels.