Liechtenstein license plate: L (1915 to 1925)

Format, years and the law

Format: L 999 (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: 1915 to 1925. No longer issued.
Vehicle class: Standard: the default series issued to private road vehicles. Issued for car, van, truck, bus, and motorcycle.
Colours: Characters #FFFFFF Background #000000
About this plate: THE PRE-FL MARK. Liechtenstein's first own registration mark: the letter L and an arabic number, replacing the Austrian "W" (Vorarlberg) plates used under the earlier Austrian-aligned regime. The decree also forbids carrying both marks at once, "Die gleichzeitige Anbringung liechtensteinischer und österreichischer Erkennungszeichen ist untersagt." RECORDED DISAGREEMENT: the 1915 decree names its own predecessor as the "Verordnung vom 10. Juni 1906, LGBl. 1906 Nr. 2", while secondary accounts date that 1906 ordinance to 18 June. The instrument says 10 June; LGBl.
About its years: START: the Verordnung of 12 August 1915 (LGBl. 1915 Nr. 13, published 18 August 1915) creates the mark. The instrument carries no separate commencement clause that was located, so 1915 rests on the instrument's own date and publication.

The series id is li-l-1915. The API returns its format, validation, colours and designs with the rest of Liechtenstein's series:

curl -s https://vehiclesdb.com/api/v1/plates/li \
  -H "Authorization: Bearer $VEHICLESDB_API_KEY" \
  | jq '.series[] | select(.id == "li-l-1915")'