Type 17, No. 542 Border
Dimensions in units:
Outside: 18 wide by 24 high, inside: 12 wide by 18 high
Segment is 6 wide by 3 high
Panel is 3 high by 19 long
There are two alternating shapes in this border: a Z pentomino and an L tetromino. It is a design that has been very useful to me and I have used it in the scripture calligraphy works listed below.