Interesting, I didn't know the Kapp Royal other than the modern high grade with faux amber stems. I did find one reference on the Petersons board, but even Jim Lilley was stumped.
https://btheinternationalpetersonpipeclub.runboard.com/t1549
Nice job on the restoration!
https://btheinternationalpetersonpipeclub.runboard.com/t1549
Nice job on the restoration!