Not yet observed in the beta: the Forever client retains this item's record without its stats. Those are sent by the server in-game.Until someone records it, the Classic tooltip is shown below. Forever has reviewed every dungeon's loot, so changes are expected.
In Classic Era, dropped by Rattlegore, Scholomance(12%).
Classic 1.15.9.69722
Rattlecage Buckler
Binds when picked up
Off HandShield
2121 Armor
39 Block
+7 Spirit
+12 Intellect
+7 Stamina
+7 Shadow Resistance
Requires Level 57
Sell Price: 3g 41s 81c
Forever Beta 1.60.1.70009
This item does not exist in the Forever client.