old antique heavy cotton crochet lace, wide insertion or border trim w/ art nouveau motifs

Late 1800s or early 1900s vintage handmade cotton lace with an art nouveau style pattern of repeats. This might have been made as altar lace, or for curtain panels or transoms?

There's three panels made to match, all very close though not identical. Each panel is about 12 1/2" wide x 74" long. All are a little discolored, though the cotton thread seems supple and sturdy on all. We haven't soaked them, this is all as found out of an estate.