Dura Ace track chain ring 50T

I'm getting weaker. I need this chain ring, because 52x16 is getting too large for a relaxed evening on the track.
Larger sprockets are rare, so the only option is to switch to smaller chain rings.
50 x 17 must be enough for the near future.
Bargain from "Marktplaats", so I couldn't let it go.

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