I was wondering if anyone can help out with some information... My grandfather picked up some shells and was wondering if I could help him in finding out about them. I figured the best place to ask would be here... He wants to know some information about them as far as how common they are and if there is any sort of collector value or anything to them.

Here's what he sent me:

top of box: STAR OLYMPIC
CLOSING 25 CARTRIDGES
CARTOUCHES
CALIBER
CALBRE 12/70


front of box: OLYMPIC 12/70

side of box: HUNTING
CARTRIDGES

CARTOUCHES
DE CHASSE

EXPORTED BY UNIVERSAL
WARSAW-POLAND

EXPORTE PAR UNIVERSAL
VARSOVIE-POLOGNE

PRODUCT OF PAWAM POLAND
PRODULT DU PAWAM POLOGNE

MADE IN POLAND
Back of box has additional info which can be forwarded in needed.
The base of the shell [brass] 12 PAWAM 12 PIONKI
The side of the shell: OLYMPIC MADE IN POLAND 2.50mm
Thanks!