It's about a tapestry fragment - just the top border - which was repaired in 1902 and still bears the lovely cross-stitch label documenting that work!
This is a perfect moment for me to step up on my soapbox and proclaim that we should all be documenting and labeling our work, both newly created and newly repaired. You could be the person who creates such joy for a collector and historian 100+ years from now!