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Is this a chick you hatched or one you purchased? If, as you said initially, this is one you hatched -- and it is indeed a Golden Comet (mom was a silver-factored White Rock and dad was a New Hampshire Red) -- then it's a cockerel. it is not just white rocks and new hampsire reds you can breed together to get sexlinks...it's also any RED roo not even a purebred to a silver factored hen (white silver factored hen)....RIRs are used a lot in breeding this
On the other hand, if you purchased Golden Comets and this is their offspring, it could very well be a pullet. Golden Comets are hybrids (a mix of two specific breeds that produces consistent results), they aren't a true breed and therefore will never be able to reproduce themselves. Their chicks will be barnyard mutts that can't be sexed when they hatch. If this is the case, the chick in question could be a pullet (and the one not in question could be a cockerel). They also can't be sold as Golden Comets since they're second generation produced by mixed breed parents.