Yep, Peterson rules the Army Mount, seen in their catalog as early as 1896! An excerpt from their website:
"The Spigot style evolved from the practice of soldiers in earlier centuries who repaired broken pipes by sliding a used cartridge case over the shank and reinserting the mouthpiece."
Does anyone know what the likely candidate would be regarding proper size cartridge casing as to form the ferrule end-cap?
There was a lot of technological advances in the late 19th century with ammo, particularly the transitioning from larger caliber to smaller caliber. I've seen somewhere an educated guess as to what was actually used for fashioning the ferrule which suggested :
7.92mm Mauser
Lee Enfield - Mk III - 7.7mm
French 8mm rifles
The cartridge casing would have to be the right size to fit the end of the shank!
Here's a pic of a box of well-preserved ammo cartridges from circa 1885:
Now,
...I was thinking about it and if you say Danish Mount, it may be confused for Freehand-style stem,
so to refine the term I think
Danish Recessed-Ring Mount would be the most accurate!
= )
...here's one of the 1960's
Sixten designed Stanwells...
.
...and on this Bo Nordh you can just barely see the metal ring:
.
...and
this interview with Cornelius Manz shows a bunch of his killer pipes done up in that style.
.
Although Modern Military Mount does sound good, it's not so much modern as it's taken everbody else time to catch up to Sixten Ivarsson, his importance & impact has been massive.
...
here's a great write-up about him.
: