It's a Crown Monarch CR1. I bought it new and it was not worn or chewed when I got it.The photos look wrong for a P-Lip, it is probably chewed or just worn, what pipe is it from, is it a Peterson, because there was many pipe makers that copied them and put the hole in a different place.
The upturn of the airway to emerge from the "dome" was patented. The shape of the stem itself was not. Result? A few companies marketed pipes with stems that FELT like Petersons to people who liked the shape, but didn't care about the upturn.
This, its a knock-off P-Lip. More of a Pee Lip. There were loads of em, you often see that style with pre-molded replacement ""P-lip"" stems. The bottom is opened up because its been worn through with pipe cleaners or repeated buffing.The upturn of the airway to emerge from the "dome" was patented. The shape of the stem itself was not. Result? A few companies marketed pipes with stems that FELT like Petersons to people who liked the shape, but didn't care about the upturn.