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Kronos is always a thing, but less so with 7400. It almost certainly would've been Campagnolo. Unless you are trying for a wall hanger which will never be ridden, use whatever you bloody well like. I would go with Ax, the brakes aren't great, but modern brakes which actually work would look wrong. When I was a kid we used to mix and match, complete groupsets were for the pros, who wouldn't have used them without the demands of their sponsors.
The forks are Air, they're very similar to the ones on my Gios Aerodynamic.