Shown in Photo-Lettering’s Alphabet Thesaurus Vol. 2 (1965) as Xenotype 3488, and in One Line (1971) both as Ringling Brothers (4465). and Staudel Xenotype N (3488). Unlike the sample may suggest, there is also a lowercase. There’s also Staudel Weinerschnitzel A (solid w/ contour) and B (outlined). Origin/designer unknown. Xenotype 3487 is a related style with flat tops and bottoms.