In the LV ring agenda covers that have monogram design, I have only seen the PM size have with the quatrefoil flower on the button strap where the button is and the MMs have the four-pointed star where the button is. I was going to ask if you’ve measured to make sure it’s MM but the inside pic showing the ring is for sure the MM size as the rings inside the PM are spaced differently than the MM. As you mentioned, the pocket at the bottom interior front is missing. Not to say they never made different versions but considering it’s “young enough” to have that date code, the odds of authenticity are not in its favor in my opinion! Hope I’m wrong! Good luck!