I'm not sure if this was ever posted before on SCF, but I found this article interesting dating back to February 2011 on Quick Response Codes on Postage Stamps:
Another QR code stamp - from Croatia. Unfortunately the scanner on my phone can't read the code because of the cancel, I think. Perhaps this is why we don't see more of them?
Thanks for posting the link 22crows, yes, very interesting. Amazing to see what can be done with "augmented reality". Good to see stamps getting involved.
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