5 Rentenmark 1926 Specimen (falsum or authentic?) [opgelost]

Hello, Is it falsum or authentic (holes)?

Cannot find any examples,  but the serial number is too random for a specimen. I'm no specialist but I'd guess fake.

Could this be a reminder cancellation, rather than a specimen?

Thank you

Unless you got answers in private, I would not consider this post as “solved”. Can still be all kind of stuff …
 

Anyway, link to the original note on numista (with very little info):

N#208942

Personally I would say it's a reprint/fake with just this singular small pictures to go by.

I don't see the tactile seal nor sings of the special paper that was used to print these notes on.