1957 5 Ptas spanish coin poss error

1957 5 Ptas spanish coin possible error Iphone pics again Sorry !! there appears to be some additonal letters/numbers on 1 side of the coin which dont match the font on this coin? Im still soaking up info regarding errors so any opinions or what the error is would be greatly appreciated.

 

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Nice die clash

 

Die clash cheers not really a desirable coin but with the error its taking a place in my error collection now

 

Actually yer profile Name Insider ?? can you elaborate ?

 

and the year of striking is in the reverse star

 

Cheers - Am I understanding this correctly the coins a 1957 with 58 in the star so it was struck in 1958 ?
If thats correct what a strange way to strike & date coins ??

 

If you look at the list in this link you will see they all have 1957 on the coin and their actual year of minting in the star
https://en.numista.com/catalogue/pieces781.html

 

Cheers interesting weird but interesting The french must have employed 1 of my fellow Irish men to work at the mint in this period of time ? hahahaha

 

eeerrmm Spanish not French