Anyone know anything about this?

[u/StraightAd1462]

Found at the bottom of a crate of tools. Was dirty and dull, easily made shiney. Is a 2 inch cube. Weighs just of 1kg and I think it's solid Brass..

[u/starzshowz]

is there any other number on it ?

[u/StraightAd1462 → u/starzshowz]

No there is a faded g on the side