specs on wild country super rock

I've inherited some nuts from a friend, and one of the smaller ones is labeled:

wild country
super rock
made in england

with a big number one on the other side. No strength rating given.

Can anyone familiar with these help me out? Im not positive, but these seem to be different than the superlight rocks wild country is currently selling, as the dimensions and appearance dont match. But then again the nut is clearly older and so could just be from a different generation.
Thanks for any help!

In case it spurs anyone's interest and knowledge, here are some photos:

The LARGE NUMBER is its size. I would state with some confidence that its rated strength is equivalent to that of the same size as a "regular" WC Rock.

Thanks! The specs on the current rocks are 7kN for rocks, and 4kN for superlight rocks. Anyone know if this has changed over the years?

Have you tried to email WC yet? I would think that would be a better source than someone's memory on MP considering you are trusting your life to it.

just go climbing.

Oh ya... Don't know why I was too dumb to think of contacting them before. Thanks.

And working on the climbing bit, but unfotunately stuck at home today.

cheers

Yer Gonna Die!