Hello Eric, this is a custom lettering style that was popularized in the 1950s and 60s, and many shops continued the practice into the 1970s. It was usually created by using the Spacerite Double Outline alphabet, removing the serifs, and modifying the leg of ‘R’ to feel more “modern”. Because the serifs were removed by hand, the letters can vary from memorial to memorial, as different shops would leave more or less of the serif, or customize certain letters. Edward R. Peterson also created a version of this style as a full-size print to be used alongside his “Art-Line Capitals”, but his version did not contain numbers. Unfortunately, there are currently no digital versions of the font available.
If you would like help matching it, feel free to use the MLC inscription matching service: https://www.monumentletteringcenter.com/product/cemetery-inscription-matching-service/