DHS h301z blade letters

[ripctt2]

Hi I saw some videos online by videos i probably mean one video but I've seen images too but on the side of DHS blades like on the handle or grip, like do they write or etch into the wood liek some numbers and letters? Because my DHS h301z blade doesnt have any of that but online images show letters + numbers. So i was wondering whether my blade was a defect or like not every single blade has them?
Like from this photo from a 2 year old post: https://www.tabletennisdaily.com/forum/attachments/dsc_0142-copy-2-jpg.25527/
+ this video by i assume the same guy but in video form:

 

[qylw]

I have H301 (non-z) in penhold and there is no serial number on the handle like in the mentioned video, but instead it is above handle... attaching image. So if you have this too, maybe the rubber covers it?
My other DHS PowerG blades have those numbers split to both sides of the handle.

 

[ripctt2]

I have H301 (non-z) in penhold and there is no serial number on the handle like in the mentioned video, but instead it is above handle... attaching image. So if you have this too, maybe the rubber covers it?
My other DHS PowerG blades have those numbers split to both sides of the handle.

Yeah i'm pretty sure i saw etched markings there. i was just wondering is this becuase it was produced more recently/earlier.