Lithuanian license plate: Moped (documented since 2004)

Format, years and the law

Format: 99LLL, for example 42ARW (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 2004; the format is likely older than the first year documented. Still issued.
Vehicle class: Moped: insurance/registration plates for mopeds (NL/DE small plates). Issued for moped.
Colours: Characters #000000 Background #FFFFFF
Size: 145 × 120 mm · every country's size
About this plate: THE MOPED MARK, on Lithuania's smallest blank. Only the plate size and the band's country code separate them, so a parse API must not treat this shape as diagnostic of either jurisdiction on its own.
Separators: recorded inference; the 145 x 120 mm moped blank is close to square and the mark is spelled solid

PRIMARY (authority): mopeds carry 'two numbers and three letters' on format 4 (145x120) https://www.regitra.lt/en/services/state-number-plates/types-of-vehicle-registration-number-license-plates/of-general...

The series id is lt-moped. The API returns its format, validation, colours and designs with the rest of Lithuania's series:

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