I’ve often seen holed silver coins initially a part of old charm bracelets. Coin collectors buy the bracelet and remove them to add to their collection. I am one.
I remember an Antiques Roadshow episode featuring a vest a family kept that their great great great grandfather had created with dozens of tiny pockets inside to hold the gold coins he used to buy their farm land when he settled. It wasn't for holed coins it was actually tiny pockets inside the vest sewn shut to hide the coins from robbers during his voyage. But it was fascinating nonetheless... maybe someone here can find that episode...!
Hare ya go. No coins, though. https://www.pbs.org/video/antiques-roadshow-appraisal-gold-rush-money-vest-ca-1849/
I always thought it fascinating how the West usually used one hole for jewelry, while India and the East used two. Two holes makes more sense, string it through both and the proper side is always showing. How we do it with one hole and the coin flips back and forth.
Prior to wristwatches men wore pocket watches and holed silver coins were sometimes used on a pocket watch fob and also with pocket watch silver chains.
Ancient, well-preserved shipwrecks have been found in the Mediterranean, buried in mud for ages. Upon excavation, coins have been discovered in the socket where the mast had been stepped; placed there by the builder. This custom is still observed in that region to this day, by local boatyards.