Best way to repair this?

[Cgas]

I can only go on what I have seen before, I understand some can have quite a rough face and be almost indistinguishable from clay bricks.

The strength of the brick sounds about right. They are effectively a pressed concrete brick (without the coarse aggregate) and as with concrete gain strength as they get older and again as with concrete shrink in size, hence the shrinkage cracks.

Of course I am probably barking up the wrong tree but it was the first thing I thought when I saw the photos.

If I take one to somewhere to brick match surely they will know? Just for curiousity?

 

[wessex101]

Certainly worth a try, if nothing else local knowledge may help. Like I said we used to have a brick works making them so we see them quite a lot in housing developments from 1950's up to late 1970's in approx. 30 mile radius. I assume they were cheaper than clay bricks.