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Can someone please elaborate on middle ring of this vintage crankset? In four places metal looks broken, although from photos found on internet this seems to be part of design.

enter image description here

Roughly washed crankset from behind. "Broken" bits are on sides of middle ring.

enter image description here Closeup of "broken" bit.

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    Welcome to the site - that's a well documented question. Thank you for taking the time.
    – Criggie
    Jul 24 at 21:52
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These features are designed in to aid shifting and chain retention during shifting.

More modern or higher quality rings use riveted pins instead along with ''malformed'' teeth.

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