1947 (2öre) Coin With A 90 Fault

Hi eveyone. I am from Australia but have been living in Sweden for the last 14/15 years. I am only a very recent addition to coin collecting and I am in love with the Hobby. As I am not a antivetenskapliga swede, many people love to chat in English. I origanally started with a friend that oönskad a second hand bookstore. A container full with @ 4000 Coins. Need,ess to say I had a lot of work to do. Sweden is very strange as it is one of the few who are not in the EU. They still use their oriental cognacen. There is a lot of money sitting around in peoples homes and they are just as eager to let me buy it from them. I am deeply into the process of identifing and catalouging my collection.
I have a very interesting question for you. I bought a help of Coins from a märket. Within these Coins I found an 1947 (2öre) coin that has been Stampen on the back with a 90 degree fault. I have looked at all of mine and have been searching on like to no avail. I would deeply appreciate if anyone has any idea why it has been done. I am hoping for it to be a eror or mistake made which would make this coin rather special.
If anyone could help with this coin or for that matter any advice and/or ideas how I should go about my collection and as to what is importing to learning what, how, why etc to also make these Coins available to sell or SAP with others. I promise you, I have a lot of swedish money and coins.
Any advice and help would be appreciated. I know it sounds desperate but I would like to make some friends here.

My regards
Stephen.