Hello, this alphabet was first produced by the PALL company in 1968 and called “Modified Roman Raised” or “Modified Roman Raised Letters” according to the PALL catalog. SKS purchased the PALL line of alphabets, and later 3M purchased SKS and produced them for a short time before they were discontinued in the early 1970s. Also in the mid 1970s the PMD began producing a version of the alphabet containing different fairly unique punctuation.
This is a font currently being worked on by the Monument Lettering Center, as other customers have expressed interest in this same alphabet. An update will be sent to you when it is finished. It is currently scheduled to be completed by May.