These look to be accurate reproductions of the 0-10 numbered knobs that Sunn used on their tube amps from the late 60's through early 70's. As I recall the originals were also made by Rogan. A forum member had Rogan make a run of these knobs a few years ago and I bought several .....look stock on my 2000S!
The Music Man knobs are very similar, but the typeface is different.....the numbers all have a more "square-shoulder" look. Lots of people might not notice the difference (especially if you replace all the knobs on your Music Man amp), but side-by-side it's pretty obvious. See the attached photo of a Music Man knob.