Colby - original comic art

Colby is a comic book series first published in 1991 (script: Greg, drawings: Michel Blanc-Dumont, colours: Claudine Blanc-Dumont).
The action takes place in the United States after the Second World War. Three former airmen pool their demobilisation bonuses to set up a private detective agency, with the aim of quickly raising enough money to buy a plane and take to the skies again as a small private company.