Having worked for a shop that ordered a special run of Bertin frames in 1975 that were called C-37 Artisan because of the additional specifications requested, 5/10 ga. 531 and many other things, Bertin could have used Super Vitus.
A label is a label, steel is steel, and good construction is just that.
Be fun to find one in my size, but there are only 3 out there.
John Jorgensen
Torrance Ca USA