1976 10F Belgium with damage [επιλυμένο]

Specifically this in the catalogue

10 Francs - Baudouin I (Dutch text) - Belgium – Numista

I recently purchased 0.5kg of mixed foreign coins - job lot donation sold as a whole by a local charity shop. 

I was lucky enough in this lot that there was a 1971 with French text that was a double die and then I came across this one for the Belgium text 1976 which has lets call it “issues”. 

What I want to know is this what are the issues called / termed as please is it a cud or a cracked die or both or nothing in particular just something a tad odd?  The coin does have a little wear with minor nicks / scratches, rim edge is smooth and shiny no faults running through it and the other side has nothing of note except the odd minor scratch. The majority of the coins I purchased were in really good condition of which a lot I didn't have or in a lot better condition than I had so am swapping out.

This coin seems to have two major "fault lines” running through it one from top to bottom and one from left to right. 

My photo's aren't brilliant but have tried to do the best I can to show without the coin reflecting light all the time.

The top fault runs through the letter G and fades slightly then you can see it curve through the crown then through the middle of the lions body (left lion) and run down the the bottom where it widens out through the number 1 in the date this is for want of a better description an “grooved/cracked” line by the time it gets to the bottom of the coin. You can really feel the difference in the levels raised to the right of the number 1 and lower to the left of the number one.

The second is a “raised” line through and across the number 10 the fades through the body of the design and heads out through the letter F for Franc.

Many thanks for any assistance.

Die Crack, more specifically 2 die cracks crossing each other and more than likely moments before the die broke into 4 pieces. Very nice, this coin is relatively cheap as just a coin due to its abundance and, well let’s just say because Belgium coins are boring after wwii.  This will add some value to this common coin.

Thank you for the reply much appreciated, my very first cracked die coin 😄 Don't care its not valuable it's interesting.

I came across an American site that listed all the different things that could happen to a coin and gave pictures. Was quite fascinated by it all.

I already had a few strange ones that didn't fit in my normal collection so I added a new folder to my collection “the strange ones”…. In other words started to make another collection within the main collection of “damaged / altered” coins wanted to see how many I could collect. 

So far the examples I have are ones mainly with post mint damage a holed coin, a coin that was made by two coins one on top of another then hit with a hammer, an over strike, somebody's home gold plating, those annoying oval squashed pennies that come up, an enamelled coin, a fake, a copy, a copper penny that seems to be being eaten by a strange green mould (super glued that one into a coin holder as didn't want that stuff getting loose in the collection) plus ones made into reference coordinates dated for when survey was done on a plot of land. 

Each one I have labelled so I know what or why or how it was done.

Yes in this case it is an error coin, like I said though this will be more valuable than one without the die cracks - and more valuable still because it is so close to the die being broken. If you image the next coin having just 1 side  of the coin, the minting process would be stopped to change out the dies and the mis-struck coins removed from the collection bucket due to quality control. These errors are worth lots and lots because they don’t get out of the mint, rarely do ones like yours get out of the mint either, so this is a rare example of die cracks. 
 

FYI: Error coins are collectible and add value, like a strike through error, post mint damaged coins are not so wipe out there value, like the plated ones. Also there is no such mould that grows on copper coins. 

Ewwww wonder what the dark green junk really is then 🤮 nope take that back don't want to know what it is! One for the bin then.

Strange what damage makes a coin more valuable and what just wipes it's value out though.

Beauty is in the eye of the beholder I suppose however in the case of green junk coins I'm booking in to get my eyes tested

The green stuff is either oils from being stored in acrylic (Harmful plastics for coins, very common) or corrosion. You should do more research before throwing it away. 
 

Rule of thumb is damage in mint is good, because they shouldnt be found out in circulation, post mint damage anyone can do themselves so there is no rarity in that and thus worthless - unfortunately there are many scammers trying to make a quick buck by damaging coins and scamming the uninformed, likewise they try to scam with the smallest and uninteresting of errors to do the same thing. 
 

Errors are one of my favourite sub genres of coin collecting (that and fakes) and I advise anyone to really learn about minting errors and what makes them worthy and adds value.

Doesn't hurt to investigate and as the green junk coin is just scrap I could experiment and nobody would be offended by me making it even worse😁

I was very fortunate and bought my fakes as fakes paid very little for them, the ones I have that are copies have copy stamped on them so those too very easy to collect. I haven't found anything “mistake wise” as yet that made me go WOW must have that and want to pay lots of money for think I would rather come as here first and ask before even considering it.

You have been most informative thank you it's appreciated.