These are vintage Universal Model 61 bicycle brake calipers, commonly used on Italian racing bikes from the 1950s through the 1970s.
Type: Center-pull brake calipers.
Era: Popular during the 1960s and 1970s, often used on prestigious Italian bicycles like Bianchi.
Features: Known for high-quality aluminum construction and distinctive script branding.
Identification: The Model 61 is distinguished from the cheaper "Sport" version by its spring mechanism, which inserts directly into the pivot post bracket rather than wrapping under the arms.