a couple of years ago, there was a project.
so, in 2015, there was a film about how to re-create the coquille technique: a gaffer (?) from Flygsfors and some active glassworkers from Kosta spent a day to recreate some coquille pieces.
Speaker text in Swedish, film found here:
https://www.youtube.com/watch?v=C10fYXwR-uU (i have problems understanding linking in this forum... never mind)