Finnish license plate: Tractor (documented since 1996)

Format, years and the law

Format: 999-LLL, for example 462-HPU (L is any letter, 9 any digit)
The format above follows the issuing rules: a registration that fits it is one this series could have issued.
Years issued: Documented since 1996; the format is likely older than the first year documented. Still issued.
Vehicle class: Agricultural: farm vehicles/equipment where separately serialized. Issued for tractor and machine.
Colours: Characters #000000 Background #F3A513
Size: 338 × 118 mm · every country's size

Tractor 397×118 mm

agricultural · 397 × 118 mm

Tractor 220×152 mm

agricultural · 220 × 152 mm
About this plate: THE YELLOW TRACTOR AND WORK-MACHINE PLATE. Same § 16(1)(3) mark as the snowmobile, three geometries instead of one, and the only Finnish rule that makes plate SIZE depend on the mark's character count.
Separators: Hyphen REQUIRED on the two single-row sizes (määräys § 3.6) and FORBIDDEN on the 152 x 220 two-row plate. § 3.6 also makes the size a function of the mark's LENGTH: 118 x 338 "silloin, kun rekisteritunnuksessa on alle 6 merkkiä", 118 x 397 for six characters, the only place in Finnish plate law where the mark's length picks the plate.

A 162/2021 § 16(1)(3) https://www.finlex.fi/api/media/statute/694140/mainPdf/main.pdf
A 1598/1995 § 36(1)(e), same rule, in force 1.1.1996 https://www.finlex.fi/fi/lainsaadanto/1995/1598
määräys § 3.6: 118 x 338 (<6 characters), 118 x 397 (6 characters), 152 x 220 (two rows, <=6 characters); § 4.3 character sizes https://www.finlex.fi/api/media/authority-regulation/536142/mainPdf/main.pdf
16.12.2024: the 220 x 152 mm tractor-ATV plate and its EU-regulation rationale, plus the Y-glyph change https://www.traficom.fi/fi/uutiset/rekisterikilpiin-uudistuksia-traktorimonkijoille-uusi-kilpityyppi-ja-parannuksia-l...
'Traktorin kilpi (220 mm x 152 mm)' and the two low tractor plates https://www.traficom.fi/fi/autoilijat/ajoneuvon-rekisterointi/suomessa-kaytettavat-rekisterikilvet

The series id is fi-tractor. The API returns its format, validation, colours and designs with the rest of Finland's series:

curl -s https://vehiclesdb.com/api/v1/plates/fi \
  -H "Authorization: Bearer $VEHICLESDB_API_KEY" \
  | jq '.series[] | select(.id == "fi-tractor")'