With it in hand what is written around the three characters on the other side?
Something like >
S. FRANZ CLET
HL. VINCENT VON PAUL [HL. = HEILIGE]
S. GABRIEL PERBOYRE
which might be wrong, or not.
Similar but different reverse >
https://www.etsy.com/listing/1055044903/blessed-francis-regis-clet-blessed-john
Seller's description: Blessed Francis Regis Clet & Blessed John Gabriel Perboyre
Antique Catholic Medal or Pendant Aluminum Metal Vintage St. Vincent De Paul
* This listing is for an Antique Catholic Medal or Pendant, made of aluminum (lightweight),
that has some light surface wear and patina. On one side, it shows raised images
of St. John Gabriel Perboyre, Blessed Francis Regis Clet, and St. Vincent De Paul,
with the lettering, "B. F. R. Clet - S. Vincent De Paul - B. J. G. Perboyre."
On the other side, the raised image of the Virgin Mary, and the French words,
"O Marie Concue Sans Peche Priez Pour Nous Qui Avons Recours A Vous" and "1830."