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Breso
That's not a C-Stem, but it does just slot over the top of the steerer so if he's got it you'll be fine.
My brother bought a used 695 where the C-Stem had been installed badly and it constantly slipped, there were knurled aluminium shim things that grip bits inside and the knurling had worn away. He got replacements for them, but it's something to look out for. The C-Stem and Z-Cranks are really nicely engineered, but they can be fucked up by poor installation. Also make sure the steerer hasn't been cut too short to use the C-Stem, though by the look of that photo it should be fine.