Xisi, Beijing, 2012
The central tile’s spec: 77/8 square, 1″ thick and 3.85 lb in weight.
Border/trim tiles: I don’t remember seeing them at our homes. (Mei Lanfang’s former home used the trim.) It seems Shanghai utilized them more than Beijing.
Seen elsewhere: in Shanghai, courtesy of Feng Guoyin 冯国鄞. This 1st photo showed QX #109/#159, 171b, 172c and 121b.