He is a golden cuckoo marans for sure .
some times the golden does not show up on the hens , same as we see in the Black copper marans population .
I like the rooster he is well colored Single barred ( dark cuckoo ) So if you breed them together you will get a double barred Golden cuckoo Cockerels and a proper golden cuckoo pullets too .
hope that helped .
Chooks man