Sorry Dia Compe
https://www.sjscycles.co.uk/brakes/diacompe-gran-compe-610-centre-pull-caliper-brake-4761-mm-drop-allen-key-fitting-front-or-rear/
They also make a cheaper version
Oh yeah, they look nice. Shame they don't come in black as they'll probably be paired with 105, and the sliver 105 looks crap.
There's plenty of silver accents in black 105, you'll be fine :-)
@Polygon started
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Sorry Dia Compe
https://www.sjscycles.co.uk/brakes/diacompe-gran-compe-610-centre-pull-caliper-brake-4761-mm-drop-allen-key-fitting-front-or-rear/
They also make a cheaper version