This is a complete military storm cooker obviously inspired by Esbit 27 and nearly identical with the Optimus 77A except the markings, strap and neck/lid/(simmer ring) of the burner. 1 liter spirit bottle used to come with this set even if it wasn't an integrated part. And the WW2 utensil kit sports the older single crown instead of the later three crowns - I now have a civilian kit without crowns too, they were identical made from pre-war to the end. What I believe to be latest military version "kåsa" is another intimate but not integrated thing. Other age of burner than other parts is common as burners were stored separate from the cookware to avoid corrosion and mated when issued to the soldiers. This lid has a Trangia O-ring - a bit too small but it works good enough. Fire! ...and one full burner was just enough for boiling fine cut potato/carrot/onion mix, frying a pack of mini salsiccia and boil the essential weapon grade coffee To compare with other look-a-likes: Left military with correct leather strap and right early Optimus 77A(should have blue/yellow textile strap) - likely made at same period in same production line. Left military and right modern similar size and form but very cheap product with Trangia-sized burner quite similar to late Optimus 88, unbranded and sold worldwide under many names, thin brown vinyl strap. Below them is the Esbit 27, smaller size and one pot but likely to be the pattern for the military stove.