3.5 out of 5

Guilloché ,  is an engraving technique in which a very precise intricate repetitive pattern or design is mechanically etched into an underlying material with very fine detail.

Above, Ministryoftype.co.uk

Guilloches mechanically turned onto watch faces.

A nice interactive online generator at Subblue.com.

Software, Excentro, for generating Guilloches.