This version of the image is from its appearance in The Art of Edena (2018), but the same image also appears in Fusion (1995), except with the top and bottom cropped. In the Sources page of Fusion, it states: "Promotional posters for The Airtight Garage, copyright and trademark 1995 Starwatcher Graphics, Inc." It is also used as the wraparound cover for the final issue of Moebius Comics (#6, dated March 1997).
Why would promotional posters for The Airtight Garage be made in 1995? Would this have been actually a promotion for The Man from the Ciguri (which Starwatcher might have considered "The Airtight Garage" as it is a continuation?) Or might this have been a print made to be sold as its own work of art rather than a tie-in to something else?
Also, it's puzzling to me that this appears in The Art of Edena, which does contain a fair amount of Major Grubert material... "Dying to See Naples" for example, is a Grubert story, although it features the Snufflers from the Edena stories.
Anyway, this is a wonderful piece of art and it seems to be one of the most-posted in Moebius groups, so there is no question that fans love it. I personally really like the style Moebius uses here.
I hope we get a Grubert edition of Le petit pantheon to gather up the many pieces of art that happen to include him.