Pedroguy,
A quick description of a patent cancel is that the canceller would cut into the stamp surface at the same time as cancelling the stamp so the ink would soak into the stamp preventing reuse. The little dots in the center of your cancel are actually pin pricks. Look at the backside of your stamp and you should see where the pins puncture the paper.
I have several files on patent cancel information that I can email you when I return home tomorrow. I am working on an article on patent cancels for the US Cancellation Club. I can post it here on this site when I finish.
Vince
Fascinating info, Vinman. I've never heard of those. I'm really looking forward to reading your article. I have quite a bit to learn about cancels. The only area I have a moderate knowledge of is the Irish slogan cancels. Some of those are super strange by today's standards, such as "teach your children to clean their teeth" and the ones about getting an "annual xray".
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"Just one more small collection, hun, really! LoL "
Just came acroos this and it made me SMILE
Thanks Vince.....BUT I got no pin pricks on the back, just a penciled value