RV275s: engraved or inked?

[Joe_Pool]

Looking at some Bosch 0 432 193 635 injectors.  They are in what appear to be Bosch boxes and sealed in yellow plastic bags.  The numbers are stenciled (inked) on them.  They are packed individually.  Are the numbers supposed to be engraved or inked on these?.  I am attaching 3 pictures.

Edited June 18, 2020 by Joe_Pool
To add information

[Royal Squire]

That kinda looks like laser etching 

[Towrigdually]

Looks like the brand new Bosch injector I had to buy a few yrs ago in a pinch when I had one fail on me at lake havasu. I think that one was laser engraved also. 

Edited June 19, 2020 by Towrigdually

[Joe_Pool]

Thanks for the responses.  I hadn't thought about laser engraving.  I will be getting these for my future upgrade.  Just wanted to make sure they are legit and it looks like they are good to go.

[Joe_Pool]

I ran my fingernail over the numbers and they are indeed etched into the metal.