On the box it says ....Loaded for Woodwards in Canada
By one of the worlds largest small arms ammunition manufacturers .
Also they are 2 5/8 " ....
So Dominion ( CIL ) Google says
This is an interesting site
http://www.cartridge-corner.com/shotgun2.htm
When I started shotgunning , 10 maybe ......3 generations of familly
In Delta marsh ......I saw a lot of equipment I'd love to have now .
These were made 1958-1961 .....not ancient. 55 plus years old .