My supervisor monitors my progress as I try to rescue this piece of antique lace from the nasty sticky backing paper someone put it on decades ago.
It is an impossibly delicate piece with super-fine thread.
Similar to this museum version, it is Brussels bobbin lace appliqué on a netting.
https://www.si.edu/object/brussels-bobbin-lace-applique-droschel-ground%3Anmah_639512