Malaysia 1981 unique error 20 sen coin?Help is needed from the experts please.Thanks

First of all,I would like to say hi to everyone over here in this forum once again and I have not yet been logging here for quite sometimes,surely missed this forum and all of you very much.




Here is a piece of Malaysia 1981 unique error 20 sen coin,both sides have difference difference error.Obverse side is with an extra date which is 1981 in a reversed position but the 8 is still looks like a 8,the date is as a hole types instead of the date raised on the surface normally on reverse side.Reverse side is without part of the surface,two parts of the rim between the 10 o'clock small surface and the surface is higher than normal surface on the same reverse side.I would think this is an unique error coin because I do not find this error in the 13 common error coins list on the websites.




Unfortunely,I still unable to confirm if this is an unique error coin or not because I am not a coin expert at all and I would think this is considered as an unique error coin,my opinion.So,I need help from the coin experts to identify it and tell me what happend to this coin during the processing and probably most of you know something about this error.Honestly,I have never seen any error coin like this before and probably this is the first time I have ever seen something like this in my whole life as a coin collector.




That is why I need help,explanation and opinion in details of what happend to this coin actually.Another question is has anyone ever seen error like this before?Your help and answer are very much apprieiciated from me.Please refer to the scans below and let me what you think.Hope to hear from you very soon.Thank you and have a nice day.

 

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Not a mint error! Vise/hammer job. Another coin pressed into the one pictured. Note that the extra date is incuse and reversed.

 

I second this statement.

 

rickmp you told this person right about their coin but you forgot to mention the damage on the other side of it. The person that put the other coin on top of this one to hammer or press the date into it had this coin resting on something that looks like it was probably a washer. This is what created the partial circle looking area.

This is what I tried to tell folks on here when they were trying to say my unusal cent coin was PMD. If a coin has severe damage on one side of it like my awesome cent coin does the other side has to be damaged also unless the coin was still resting on the coin die or someone uses something like a grinder to damage one side only.

 

I'm not going there with you!

 

Or is one something relatively hard but softer than the coin. (Soft brass, zinc, aluminum plate, hard leather or rubber, even wood.) The coin is able to compress the detail into the soft substrate until it can support the entire surface, but it still can allow major damage to occur to the top surface. For example this was how the Scott restrike CSA half dollars were created. The coins wer placed face down on a soft brass plate and the reverse was struck with the CSA die.

 

OMG,I thought it was a minted error but it was a Vise/hammer job.Thank you for letting me know and I have just realized that,probably I was hit by a hammer from someone else.

 

oh good lord not this again