Levi jeans for juniors late 60s, early 1970's

Hello, first time posting so please be gentle.

Does anyone remember LEVI'S that were produced for boys, think late 60s or early 70s, that came with internal reinforced knee pads?

Think the kneepads might even have been leather, or a leather lookalike material. The pads weren't visible, only when the denim became worn.

Remember they had a smaller Levi patch on the back, and think the pocket tag was white.

Cannot find anything about these online so, any pointers or info would be much appreciated.

Many thanks.

Bevan Gibbs