I was given a full packet of Winchester .22 Shorts containing 50 bullets. The box is coloured white, dark blue and red. On the front of the packet are the words "KOPPER KLAD BULLET". On the sides are the words "STAYNLESS".
The cases and bullets are copper plated and headstamped with the letter "H".
The serial number on the box is "K 2297R" and weas manufactured in the USA by Winchester Repeating Arms Co.

Would anyone know how old these bullets are and how much they are worth?

Any help would be greatly appreciated