Tegiment, according to this site is a steel hardening process created by Sinn, a watch company:
"In recent years Sinn succeeded to use its Tegiment technology to enhance several of its popular watches. Tegiment is a process in which the steel gets hardened to 1200 Vickers (approximately 6 times harder than normal steel)..."
Here's another site, that discusses how Sinn uses the tegiment process in watch development.
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