Nigerian license plate: Dealer (2012 to today)

Format, years and the law

Format: LL L999 9, for example DQ K508 4 (L is any letter, 9 any digit)
The format above is broad: a registration that fits it has the right shape, which does not show that this series issued it.
Years issued: 2012 to today. Still issued.
Vehicle class: Dealer: trade/garage plates bound to a business, not a vehicle. Issued for car, van, truck, and bus.
About this plate: Trade and dealer plates, issued to motor dealers and mechanic workshop operators (regs. 26(4), 30-32, Form MVA 10). Reg. 31 enumerates the FIELDS verbatim, national flag symbol, dealer name, dealer's code, State code, dealer's number (alphanumeric), individual vehicle code (alphanumeric), "Federal Republic of Nigeria", but again gives no mask; the shape here approximates Schedule 5 Fig. TWO STATUTORY RESTRICTIONS WORTH CARRYING because they are conditions of validity rather than design: a dealer plate may not carry fee-paying passengers, and it MAY NOT BE USED BETWEEN 18:00 AND 06:00. Workshop plates are road-test only.

The series id is ng-dealer. The API returns its format, validation, colours and designs with the rest of Nigeria's series:

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