Well we have searched till our eyes have misted over. The glass blocks/bricks we have looked have the following dimensions 115x115x80, 146x146x80, 190x190x80, 190x190x100,240x240x80 and another huge one. Ours is 135x135x50. Ours has a recess that is finished exactly like a crystal ashtray I have. The depth is also the same size as my crystal ashtray. Now I know Max knows her stuff but I am not 100% convinced that this could be a glass brick/block. If you had a wall full of the block we have with the recess on ours how on earth would it be kept clean it just isn't practical.
Any more thoughts before I log this as an ugly glass block.
Margi