Originally Posted by
Crankycrank
That doesn't look like a 10sp chain with the mushroomed pins. I think in current terms that would be a 5sp as in a 5 cog freewheel. In any case you can just push the pins back in with that type of chain but be very clear how to do it properly. The pins need to be mushroomed out again with the chain tool.
Back in the day when Campy Velox was an option "ten speed" meant 2×5 not 1×10. Context is everything.