an interesting study.
I don't know if it was common practice for cuffs to come in sets of three so you would always have a spare, but my cuffs certainly did.
It's not that clear in the photos however one cuff is whiter then the others. Perhaps it didn't see as much wear or perhaps it was cleaned.
thingamabobs which probably have a proper name but I can't think of it right now. You can see the stitching is tiny and done by machine.
The lace is machine stitched in place. You can see around the edges of the cuff where the fabric has been trimmed away after the purfylling (embellishing) has been completed.
How do you think that little cut got into the corner? Trimming the threads, trimming the excess fabric, or later by something else entirely? I guess we'll never know.
All nine cuffs are surprisingly thin, fine and stiff. They appear to be made of linen, but I'm no expert. It seems to me there is a stiffening layer sandwiched between the outer-layers and all glued together so they behave as a single layer.
I don't think they would have been terribly comfortable, but I imagine they always looked great!