Hello, thanks for posting. This is an unknown version of Modified Roman, which at the very least has been hand-painted, so it is hard to tell where the actual engraving is versus just black paint spilling over, but it looks possible that the letters may have been hand-drawn and/or hand-cut in stencil as well. Most notably, each of the R’s are quite different in appearance.
Either way, this is not a version of Modified Roman that I think you will find an exact digital match for, but it does seem to follow the same basic letter forms as the Spacerite Modified Roman. The MLC version will match fairly closely to this, with perhaps a slight stroke/outline added for extra thickness. The small differences between the two versions of the lettering/font shouldn’t be glaring, especially because the font will be used on an entirely separate memorial and not for adding information only a few inches away from existing lettering on the original memorial.