🔎 UNIDENTIFIED Found at a 1940's dump today. Heavy duty cast iron latch or hook?

[FreeBirdTim]

Found this at a 1940's dump today. Heavy duty latch or hook that weighs 5 1/4 pounds! Any help to ID it and tell me what it was used for would be appreciated.

what it was used for would be appreciated.

 

[villagenut]

Looks like a dump truck tail gate latch