Rare vintage Mega 'Bloks' - Ritvik 9510

Ritvik micro mega 'bloks' in a bucket- 9510, from the mid nineties I think. The container has a handle built in for ease in transporting. The blocks are small not chunky, and work with other leading brands. Lid on bucket can be used as a base to build upon. It says there are 300 small pieces, but I have just counted them and there seems to be 305 (see photos of piles of 10.) The bucket doesn’t look very full but as I have said there are over 300 inside. New never used. Only been out of the box to photograph and count. Quite rare now. I presume that they are plastic. The was originally older sellotape across 2 sides (see photos) which I have not tried to clean off, hence only £10. I can bundle with other items to save on postage.