I've seen a few of these without the "R." That didn't send a Red Flag for me. What does is if that one weigh less than 5 grams. A Henning should weigh around 5.4 grams (minus a little because they tend to get worn quite easily). This one is worn, but is half of a gram worn off?
Also, that "44" is a lot sharper than Hennings often are...Hennings tend to have a flatter "44."
Personally, and I base it only on my hunch, it is one of two things: 1.) Either someone may have scraped off the "P" of a War Nickel
(not the seller per se...but someone), since a Henning will bring in more than a War Nickel
. OR: 2.) Overly greased dies have been known to keep the P from striking on War Nickels
. Here are Rev and Obv photos of one of those War Nickels
without the P.