An open version of Roman inscriptional caps, similar to Van Krimpen’s Open Kapitalen. Comes with numerals and punctuation, but no lowercase. First cast by Bauer in 1952. Alternates for MNR [Schriftenkartei index card] and apparently also Y [1968 use].
Later adapted by VGC, who added a solid style, see Columna Solid.
The only known digitization of the open style is the unsatisfying OPTI Columna (Castcraft, 2006).