These two religious "medalyky" (medallions) are from the Pechers'ka Lavra in Kyyiv.  They are contemporary.

Front of back views of the first medal.  It is approx.4.5 cm by 5.1 cm.
 
 

Front of back views of the second medal.  It is approx.2.7 cm by 4.9 cm.

Here is the first medal, enlarged 2x.
 
 

Here is the second medal, enlarged 2x.