Please help me identify this non-lego brick set. I got this bricks set in the 1980's and had a lot of fun with them. But I cannot find what they are. I lost the box, but i remember there was a castle pictured on box. Build quality is quite good and they still stick and fit well. Brick is exactly 1x1cm (black cube, white ones without connector ends) and there is also "plating" that can attach to brick and small window.