minecraft-assets/assets/minecraft/models/item/anvil_intact.json

{
    "parent": "block/anvil_undamaged",
    "display": {
        "thirdperson": {
            "rotation": [ 10, -45, 170 ],
            "translation": [ 0.25, 1.5, -2.5 ],
            "scale": [ 0.375, 0.375, 0.375 ]
        }
    }
}