White-Crested Blue
A variant of Polish (Gallus gallus domesticus)

Representative Polishphoto — a dedicated image of this exact morph isn't available yet.
Slate/lavender 'blue' body (Andalusian blue gene) with a white crest. Because blue is heterozygous, a pen throws roughly blue, black, and splash offspring rather than breeding true.
Keeper tips for this variant
Don't expect 100% blue chicks — pair blue x splash for the highest blue ratio, and keep that vision-blocking crest trimmed enough for the bird to navigate.