In the rush to put on the new chain (had a helper that likes to push things along) I did not notice that on the back of the master link where the pins come (factory installed) through the link the connections/heads look different.

One of them looks like the standard peen i.e. it has a mushroom head where the pin has been peened, obviously by machine as it is so nice and round... The other pin does not. it comes out just flush with the link plate, and appears to be solidly in place but it does not have the mushroom head. It appears to be factory that way and there is no sign of a head having split off during the abusive peening effort. But this makes me a little cautious hence I was wondering if anyone here has seen this and sees this as a problem or situation normal?

Thanks

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique