A recent post by jch02140 identified this design as Constantine, which was patented by Andrew Little (Farmer, Little & Co.) in 1871 [USPTO D5450]. It is illustrated in the book of specimens published by Ron Yablon,¹ and his discovery prompted me to update it.
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¹Yablon, R. (1970): Typography & Design Devices. Art Direction Book Co., Inc. (Glenbrook, CT)