How old? What does “MC 59” mean?
The selling price. During the communist era the most of the prices were determined and fixed by the government.
The price of this box of ammo was 59 Czechosolvak Koruns.
Cannot give you a date but it is interesting to know what MC means.
I have a similar 22 hornet box that was worth MC 46
I just saw some of these boxes pictured on the cover of issue 328 of the IAA journal (1985) but there is no other info included.
Edit to add info found in issue 329 page 13. History of Small Arms Cartridge Manufacture in Czechoslovakia Part 3 written by Vladislav Badalik.
The S&B commercial headstamp and new box design introduced in mid 1983 according to the article.