whaling ships block

[resurector]

this is a large(35lbs) launch pully with wooden wheels,that i was told was used to launch the individual dorys from the main ship.Its stamped on the hook"raymond releasing hook #1 1881". Its a ingenius concept.the weight of the hanging boat kept the hook engaged until the boat floated taking the weight off the hook an it wood fall open..Do you good folks think its worth keepin?is it valuable?