@stamporator
As I'm not an English native speaker, I thought that "stamp ink" was the right term for it.
Sorry, if I was misunderstood, of course I meant the "cancellation ink", that should touch the inside of the holes in the cancelling process at the post office.
But wouldn't be printing the stamp's front after perforation a silly idea?
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By the way ... I probably should get more into Australian official perfins. As I wrote, I have no deeper knowledge about those, I'm just collecting them by issue.
