Question on relic helmet,

Hi,
The other day i picked up two relic helmets one a M42 in ok condition, the other i thought a 42 also. This has some damage, it also has like rounded rivets in the breather holes, iv only seen one in the past with this and it was a winter camo one, could anyone tell me why the helmet would have these rivets im interested to know.
thanks Dave

sorry i cant send pics

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