Looks a lot like it, but to me the mintmark positioning seems a little low on yours. The "D" on yours is closer to the 5, and on RPM-018, the "D" looks to be closer to the 9. Maybe I'm being too critical. mybe one of the other RPM's for the 52-D?
I had trouble navigating copper coins. I noticed that RPM 18 wasn't an exact match (based on markers/positioning). I wasn't sure if all of the markers had to line up, or if those are general guidelines. I'm still very new to this.