I'm not an expert, but it's not unlikely that you've got a counterfeit there. The round pound in many forms has apparently been subject to huge amounts of counterfeiting. So much so that they had to be demonetized, if I remember correctly.
Everyday shoppers don't bother to look at their change too closely so it didn't really matter about the date.
If it looked near enough you could get away with it.
I've got a few fakes squirreled away somewhere along with a couple £2.00's
Quote: "Andrej_SVK"Thanks a lot !
Just a stupid question: Why anyone made fake coin with wrong date ? with the correct one should be easier, no ?
I believe that since so many people were not collectors and there were too many designs to remember for a non-collector, they didn't care too much about having the right design for the right date, as it would likely pass as a genuine coin to a clueless shopkeeper.