These eggs come from a pair of Snowy Nikkeis. The parents are both white, but the roo is of an undescribed mutation known as Mother-of-Pearl, while the female may be recessive white- it is unknown. The two pure white birds have offspring of many different colors, including a blue and gold, black, birchen, copper-necked, etc. This is not a standardized breed at all, so much as it is a race of birds known to a specific area of South America. This pair produces about 20% white offspring, with many other colors. The Nikkei/Mapuche Huastec is a breed originating in the late eighteen hundreds from Japanese Jittoko, Japanese White Silky, and Crested Mapuche Founders. This breed is as unique to South America as the Plymouth Rock is to North America. There is info on various threads if you search BYC, such as this one: https://www.backyardchickens.com/forum/viewtopic.php?id=387218 The eggs are a large white or off-white, and they lay very regularly. For the small size of the bird, the egg is huge. The males often have an extra toe, and the skin is black or slate. The comb can be single, pea, or walnut, sometimes a strawberry or cushion- very inconsistent. There is a minor crest in these birds, as is consistent with most birds from this region. The crow is a bit of a chuckling cry.