Rotary Engraving Processes

[Woody2Shoes]

I assume that this 17/18th century button was not incised/engraved by hand, but by some simple mechanical process using gears/cogs.
Can anyone tell me more about the machine/process that might have been used TIA W2S

 

[ChaiLatte]

Look up 'ornamental turning'. Look up 'guilloche'. Look up 'engine turning'.

https://en.wikipedia.org/wiki/Guillochéhttps://archive.org/search?query=ornamental+turning

 

[Woody2Shoes]

Thanks! I think you've nailed it.