Mini Sheet is square format.Although this edition was authorized by the Niger postal administration, it was not sold in Niger, but only distributed to the novelty trade by the Nigerian philatelic agency.
Also in the issue Dinosaurs (2018.2):
Data entry completed
|Mini Sheet Water Dinosaurs in digits|
|Face Value:||4*800 West African CFA franc|
Mini Sheet Water Dinosaurs it reflects the thematic directions:
For more information about Water Dinosaurs, you can search for GOOGLE