Modern silver 10 mk - opinions requested

Hello

I recently bought a silver Finnish 10 markkaa 1971. The coin looks really good, it has cartwheel, it has clearly been well stored. As far as I know, the original plastic folder has been bought later, but that's ok.

There's clearly a flow though, an irregularity on the edge. My guess is that it fell on the ground. Pictures below.
Now, my question is, considering that for the rest the coin is really really good (no scratches, no oxidation etc) but it's not rare, how does this flaw affect its value? Is it negligible, taking into consideration that it is not very easy, at least for me, to find these coins well preserved?

Opinions from experienced collectors are particularly appreciated.

Thank you!

Hi. That edge flow does not cost you much, perhaps 1 eur or less. For you to know that I can arrange these coins in addition to other Finnish silver commemorative coins easily. I live in Finland and I'm a member of our local Numismatic Association. You mentioned that the plastic folder has been bought later, are you sure. Because most of these coins have that similar blue folder and you should remove your coin out of that folder because some or most of these folders cause unwanted green patina to your coin. So don't worry, your coin is very nice example.

Oh, thank you very much!

So you say that basically that flow is negligible. Very very good.
I have now completed the first series of Finnish commemoratives, but it's good to know you have ties with the numismatic associations there. If you are looking for some Italian coins or just need some tips, feel free to ask.

About the plastic folder... Maybe I was wrong, the coin has always been kept in it. All these type of coins that I have are in their original folders, and none has any green patina. I suppose the folders that I own are not made in that type of reactive plastic (I checked it, it's rigid btw)
Now, my question is... Since they have been in those folders for ages and nothing has happened, and I like to keep them there because I like the cool "vintage effect", is it ok if I leave them where they are?

Kiitos again =)

Most of my friends have taken coins out of those folders but still keepig the folders safe, because, as you said, they are their original folders and when you sell them you once again take the folders in use. Just don't forget what I mentioned and don't forget you are using those folders.