Question On 1954 Czechoslovakia 10 Haleru Stamp

Is anyone familiar with this stamp? I don't have access to any catalogs...I'm just using the StampWorld site to identify my childhood stamp collection (using that term loosely). I believe it's identified as a 1954 "Figure of Value" stamp, with no watermark and perforation of 12.5. BUT...by my measurement, it's actually 11.25 by 11.75. So either I have the wrong stamp, StampWorld is incorrect on the perforation, or it's a variation they don't have listed. Any thoughts would be appreciated! Thanks.

Stampy it is a postage due

Yes, it is. 12.5 perforation listed.

These can be P12.5 and 11.5
Perf 11.5 is from a 1963 printing.

So it's option C (a variation that StampWorld doesn't have listed). I have to admit a small part of me had hope for option D, that it was an error, but not too big a part due to prior experience with similar things on StampWorld. LOL!

Many thanks for taking the time to respond.

You're welcome.
Note: Often Scott does not go to quarter guage in perforations, hence your slight variations. But they are the 1963 prints.