GLAZED SPECKLE BRICK

I am completely charmed by the elegance of this rare glazed and speckled brick. Colors: sand with black and not a glossy glaze but a matter, so subtle I almost didn't recognize them as glazed. Complimented with a rosy Tiny Pebble mortar.

Guess where these bricks are located and win a prize.
Hint: Not TGS/H.