Japanese or something else?

That's beyond poor quality in my opinion, even for a hatchery. One of the hallmarks of Japanese bantams is their short legs. This one would be more the leg length of an Old English bantam. Add to the way off color, I think its a mix.
I thought he was old English, but my old English don't stand like that, or hold their tail that way. He is quite the boisterous boy. He tries to breed the Easter Eggers and will sometimes challenge the head roo, who is standard size.
 
He is gorgeous! I thought my boy was a bit big to be Serama. Is there a size range requirement?

There three classes of Seramas. A, B, and C.
Mature Serama Males

Class A up to 350 grams (12.35 oz)

Class B up to 500 grams (17.64 oz)

Class C up to 600 grams (21.16 oz)

Mature Serama Females

Class A up to 325 grams (11.46 oz)

Class B up to 425 grams (14.99 oz)

Class C up to 525 grams (18.52 oz)
 
That's beyond poor quality in my opinion, even for a hatchery. One of the hallmarks of Japanese bantams is their short legs. This one would be more the leg length of an Old English bantam. Add to the way off color, I think its a mix.
Gray, you can't breed for 100% short legged offspring. It's impossible. The Creeper gene responsible for the short legs is autosomal dominant and lethal. 2 copies and the embryo dies before hatch.
The gene is also associated with major health complications and organ failure. In order to get short legged offspring you must either breed a short leg to a short leg or a short leg to a long leg. Economics dictates that having a large breeder flock with the creeper gene is good way to lose money either through low hatch rates or low fertility due to inability to mate properly (males) or possibly not enough room to form an egg in females since the gene compacts their guts and abdomen as well.

Therefore, hatchery stock is probably never going to throw short legs.
 
I think that it's a Japanese Bantam, hatchery quality. Hatcheries may have some lines that were originally outcrossed with Serama to improve tail posture, thus the green legs.

I raise JB and unless you are showing the bird, it is not required to have short legs. In matings involving the short legs, only 50-75% of offspring can have short legs.
 

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