Italic-only in 3 sizes (10, 12, 18pt) with swelled strokes and swash caps. Origin uncertain, but first known appearance is in Conner & Sons’ 1873 catalog and an 1878 patent by James M. Conner appears to describe the design. Sold by AG für Schriftgießerei u. M. as Zirkularschrift. [Seemann]

No known digitization, but the lowercase is quite similar to Clifton Italic (used for sample).