Which one do you think it is? I'm too lazy to go look for you. When you overexpose your pictures, there is nothing where it is white. Slight under-exposure is better and your lighting seems too harsh and direct to capture relief details needed to really determine that to be a RPM other than potentially by its outline shape. Note the thick black outline shadows that surround your devices and the mint mark. You may peek into ISO settings if you have access to tweak them, lower will generally prove better although you'll need even more well diffused lighting. Also see my reply to you showing how to shoot it from an angle. Feel free to advise me to urinate up a rope if you'd rather I made no comments about your rapidly improved photo-skills.
I referenced the RPM-001 on Variety Vista as it relates to the hole in the "D", this coin does not have the double off the "D", I was wondering if the marks on the north of the "D" were significant as I could not find an example of them. Nothing good would be served by a wet rope. Do you know how many "ropes" there are on a Navy ship, wet or otherwise?
I dropped the angle to soften the light, I don't know much, but there seems to be a lot going on on the surface of the D. Is there anything to discuss or no?
I actually do not, but, work closely with a retired naval commander. I imagine I could ask him. I'd guess exactly as many as are needed. How many? Try jacking that coin up on an angle and seeing if you can soften those harsh black shadows, maybe getting some nice soft light on edges that will reveal needed data to verify RPM-001 or perhaps another. https://www.cointalk.com/threads/1968-p-lmc-unusual-die-break.299322/#post-2789890 I wouldn't mind if you acknowledged my post to you in the link and answer. ;-) Huge improvement shown in your pictures where you are paying much more attention to your lighting sources and direction. The one posted is good for establishing the outline shapes, but, it stops at that point. Same for your second posted image, still slightly overexposed and somewhat harsh, patently flat showing no relief or details of the non-horizontal surfaces.
And since I do not know what you are working with and what the software allows, tweaking the 'gamma' may help with the excessively high contrast which may or may not be why you are getting those bold black outlines. This is assuming you've tweaked the contrast, if available and gamma adjustments are buried in your settings. The second one is better as far as the exposure.
Sorry for the delay in response, as family issues arose and took me into a different direction for sometime. The answer on the "rope" question is one, it is on the ship's bell, the rest are line, Hawser or "small stuff" which is cordage. When you are a Seaman Apprentice on ship, they send you off looking for "rope", a goose chase as a prank or a bucket of steam. I painted the light source on the inside of my microscope with a thin coat of grey translucent paint to drop the intensity. I was unable to raise a die mark on the above coin surface. Please check out my '57 D post.
