I’ve never really thought about how it’s done on the older generation parts. On the newest it’s etched by laser. We had a generation where it was stick on barcode and that was the worst.

Usually it’s the date code.

At my company that code would mean 2019 week 1 (first week of jan). We also do a shift number as a 3rd part.

It’s also common for the second number to be months.

It’s even funnier/worse then I expected.

Jerboa notices that’s a link and makes it click able but clicking it opens my default email client instead of anything lemmy.