This item is currently not available in the Guild Wars 2 Api and you are seeing the last know version. The item has either been removed from the game or needs to be rediscovered.
Unlocked Skins History Data {"item_id": "31657",
"name": "Lionguard Warhammer",
"description": "",
"type": "Weapon",
"level": "80",
"rarity": "Exotic",
"vendor_value": "396",
"icon_file_id": "779978",
"icon_file_signature": "95B8CE065F519B06A007FF0F7E7EACDD95C2E40E",
"default_skin": "4627",
"upgrade_recipes": [],
"game_types":
["Pvp", "PvpLobby"
], "flags":
["NoSell", "SoulbindOnAcquire", "SoulBindOnUse"
], "restrictions": [],
"details":
{"type": "Hammer",
"damage_type": "Physical",
"min_power": "985",
"max_power": "1111",
"defense": "0",
"infusion_slots": [],
"suffix_item_id": "",
"secondary_suffix_item_id": ""
} }