Sticker and plate timeline
First identify whether the item uses a sticker-era number or a current mixed-character plate before consulting a year range.
| Approximate era | Marking | What can be read |
|---|---|---|
| Before 1984 | Usually no serial sticker | No serial-based date |
| 1984–1986 | Early six-digit/plain sticker references | Broad early period; published charts differ |
| 1986–2005 | Seven-digit sticker | Leading series digit gives an approximate window |
| 2005–2021/22 | Eight-digit sticker | First two digits give an approximate series |
| 2021–2022 transition onward | Metal plate with randomized mixed characters | Unique identifier; no public date key |
