This is a military surplus ammunition can, specifically marked for 840 rounds of 5.56mm M855A1 ball ammunition, packed in 10-round clips. The markings "LC-14B907-001" refer to a lot or production code.
This is an authentic U.S. Military Surplus M2A2 model ammo can, often used for storing and transporting ammunition or other gear.
It features all-steel construction, reinforced hinges, and an easy-open latch, with a watertight rubber gasket seal to protect contents.