No doubt this is called an “Army” because of the military mount stem, but while a military mount is not at all unusual, the way this button is cut is extremely unusual. Fortunately, we have pictures, because if I had to describe it verbally, the best I could do is call it somewhat like an upside down Peterson stem, although that isn’t all that accurate, either. I will say that set properly in place, or even upside down (looking much like a Peterson P-lip)it is not uncomfortable…and not terribly comfortable. Why not just a normal horizontal slit? The stem material is acrylic, I think, and the condition of the pipe is excellent all around. It’s a Grp. 5 in size.
5.5” long, bowl 2” tall. Weight: 1.25 oz., 36 grams.