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Direct part marking (DPM) is a process to permanently mark parts with product information including serial numbers, part numbers, date codes, and barcodes. This is done to allow the tracking of parts through the full life cycle. The interpretation of 'permanent' often depends on the context the part is used.
The plate number is on one stamp out of the number of stamps printed by a single revolution of rotary printing press used to print the stamps. In the example above, which is a closeup of a strip of 1996 "flag over porch" self-adhesive stamps, we can see a plate number comprising five digits, one for each color layer.
Bates Automatic Numbering-Machine, approx 1906, with a number printed by the machine. Bates numbering (also known as Bates stamping, Bates branding, Bates coding or Bates labeling) is a method of sequentially numbering pages with a reference number. A hand-operated Bates numbering device is used to "stamp" a number on a page, and the numbers ...
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The United States National Research Council released a report in 2008 that endorsed the investigation of microstamping as an alternative to ballistic markings.It had concluded that a national database of ballistic markings is unworkable and that there is not enough scientific evidence that, "every gun leaves microscopic marks on bullets and cartridge cases that are unique to that weapon and ...
The treatment of these has long been a vexing issue, and catalogs vary greatly on whether to list the stamps. A related issue is a small number of extremely rare stamps that may or may not be old forgeries; the assignment or removal of a number is a key step in the consensus as to their authenticity.
Serial numbers are often used in network protocols. However, most sequence numbers in computer protocols are limited to a fixed number of bits, and will wrap around after sufficiently many numbers have been allocated. Thus, recently allocated serial numbers may duplicate very old serial numbers, but not other recently allocated serial numbers.
On coil stamps (stamps issued in a long band of single stamps with the edges imperforate) a plate number sometimes is printed on the margin of a stamp, which collectors refer to as a plate number coil. Mint plate number coil stamps are most often collected as strips of three or five with the stamp with the plate number at the center of the ...