I really am not seeing an Isbar. Their type is lighter and they don’t have feathered legs. Isbars also often have very dark eyes. These guys look just like Blue Birchen Marans, right skin color, lightly feathered legs, and very similar build. I just think their earlobe color is wrong. If not, they’re definitely Marans-derived and probably Olive Eggers. I would be curious what egg color they carry