Here is an RPM that I have not been able to attribute. It has a very clear separation on the upright and both serifs. It also has some faint evidence of a 3rd punching on the serifs, though this could be easily overlooked or disputed.
Here's a high resolution 2-D image:

And here are some 3D perspective renderings to show some alternate views:




Here's a high resolution 2-D image:

And here are some 3D perspective renderings to show some alternate views:





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