Looking at the portion of the transcribed act in Firenze you have posted I was able to see the date and record number of the original record.
Here is the original (#102, right side):
https://www.familysearch.org/ark:/61903/3:1:3QS7-99WR-661X
It's dated 27 Jun 1879.
Groom: Giovanni Ippolito Antonio Cavallini, age 22, gymnast, born in Firenze, single, son of the married couple living Giuseppe, gymnast, living in Firenze, and living Paolina Matucci, equestrienne, living in Firenze
Bride: Giuseppa Maria Catterina Costa, age 17, gymnast, born in Gallarate (Varese), living in Pavia, single, daughter of the married couple living Luigi, horse dealer, living in Pavia, and deceased Carolina Pozzoli, ???
Note also that this is only a civil marriage record. Church marriages were recorded separately in this era so if they had a church marriage, it may have been on a different date.
PS - also found Carolina Pozzoli's 1871 death record, I will add to her profile and link it.