The rarity of Mortar Forge is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Mortar Forge is a skin for Clockwerk. The skin was added to the game on June 12, 2014, it was created by Robo.
Mortar Forge is currently one of the most popular skins, but it is rarely seen in the game due to its high price.