Found new owner
It seems the "Kings Imperial" brand didn't belong to one specific manufacturer exclusively. Some experts mention such pipes were made by Blakemar and by John Redman. But the most frequently you may see the "Kings Imperial" pipes produced by Invicta - one of the young, but already highly respected English factories. We're pretty sure this example was made by Invicta too - the stamping was made in capital letters and the country of manufactory is designated just as "ENGLAND" - exactly as Invicta does. Nice and convincing English pipe of a very interesting and rare shape!
The pipe markings are "KING'S IMPERIAL \ ENGLAND". The length is 14.0 cm (5.51"), bowl's height is 5.2 cm (2.05"). External diameter of the bowl is 4.0 cm (1.57"), internal diameter is 2.1 cm (0.83"). The depth is 4.2 cm (1.65") and this pipe weights 55 gr. Briar, vulcanite stem, no filter. The chamber has been protected with a break-in coat. The stummel had a few scratches and small chips which were carefully and reliably patched during the restoration.