Certified by Karl Stephens sold to my parents probably in 1980. 

***NOTE: Listing has been revised and pictures updated after research into the grading scale used by Karl Stephens.*** 

RE his certification rubric: 

"We have received questions from time to time about our grading of uncirculated coins.  Wile we don’t use MS numbers in our lists as a rule, we do have a  verbal description that corresponds to each number.  Fortunately, the price ratio versus MS# on foreign coins is miniscule.  For clarity, and for comparing on coin with another, we do feel as accurate a description as possible is desirable."

Written on packaging:

1952 Austria - 5 Schilling

Ch PRF [Choice Proof]

Y-94

OY 

From Numista: 

Austria coat of arms (an eagle carries the Austrian escutcheon)

The country around the top, the value in centre and the denomination around the bottom.

* According to Karl Stephens website, Choice Proof translates to an MS number of 65. Link is here: https://karlstephensinc.com/grading-notes/

Coin has been kept in a safe deposit box for 40 years. 

Note, I am not a coin person. I am selling these from a private family collection.