7.62 NATO Belt link M13 "hole" variation

I have (7) 7.62 NATO belt links. I have questions on 2 of them:
1 of them does not have the hole that others do and also has a NATO stamp on it. The others have holes, but 1 also has a NATO stamp on the side of it. Are they signifying different loads, or links for a different style of machine/mini gun?

Both are regular M13 links. The hole became optional in a revision added to the original manufacturing specifications. Later, it was discovered that stoppages and jams are prone to occur more often in the Minigun when using links with holes.

Regards,

Fede

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Thank you!

Grant