American quilted patchwork plaid XIXth

American patchwork plaid, from the 19th, "quilted": quilted, by hand. It consists of "blocks", a central square surrounded by 4 others in cross, the other 4 in corner being made of 2 triangles. A wide border surrounds each block. There are 30 of them on the whole book! Which is however very light. We see a trace on one of the photos, a spot that is not annoying but that I prefer to report. It is a rare piece, perfectly authentic.