Taken from Ludlow's painting in the later edition of Wright's Book of Poultry
(Note the fineness of the pencilling. I would prefer her tail carried higher and more open)

The Female
Select your very best exhibition quality female. She will be an even rich golden bay, as fine and even in pencilling as can be got. The pencilling must be well defined, straight across the feather with no mossiness or peppering. The ratio of black to ground is exactly 1:1. Pay particular attention to breast markings as these MUST extend evenly right up to the throat. Her hackles should be completely free from black. Look for a hen with a wide tail, thick at the base and carried in fan fashion. NEVER use a hen which has weak or no markings on her front and breast.

Body, breast and back feathers from a pullet breeding female
(Note the even pencilling and no mossiness on the back)

The Male
The male to use with such hens will be from a pullet breeding strain. He will be much darker in ground colour than an exhibition male, almost maroon but avoid birds with dull brown patches. He will have pencilling on his wings and sometimes patches of pencilled feathers on his body. Study the markings on his wings carefully, the finer the pencilling he has here, the better pencilling he will give his daughters. His tail will be full, with lacing much coarser than on an exhibition male, with perhaps some coarse pencilling. It is important to check his sisters for correct exhibition quality, for if they are good, he will likely sire daughters of similar quality.
(Hen feathered males are very rare and usually have Campine blood which is to be avoided - See Part 1 for indicators of Campine blood).

This essay is written from my own personal experiences and from hints given me by old breeders now passed on.