Hello, I found this looking through some old stuff my grandpa left me after he passed away. I just googled stamps and recognized that this one (pictured below) was is his collection.
Now, I have no clue about stamps but tried to look it up myself but then I realized how many different versions of this stamp there is.
It measures roughly 2,5 cm vertically and 2 cm horizontal.
What I have collected so far is that it looks like there is 11 holes
per 2 cm vertically (maybe 11,5) on the stamp perforation and 11 holes horizontal.
I tried following this guide
on how to specify which one it is and I would say it is Type 1 or 1A but I'm not so sure.
Thats why I went here for help.
Thank you in advance!