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, 100th wheel, 1000th wheel, 10000th wheel and 100000th 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 100th and 1000th 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 101st sheet onwards till desired number of sheets is performed after assigning suitable value to first numbering box of 101st sheet by using the character profile of 100th and 1000th wheels.