valuable security

means a document which is, or purports to be, a document where by any legal right is created, extended, transferred, restricted, extinguished or released, or where by any person acknowledges that he lies under
legal liability, or has not a certain legal right.

Illustration.

A writes his name on the back of a bill of exchange. As the effect of this endorsement is to transfer the right to the bill to any person who may become the lawful holder of it, the endorsement is a “valuable security”;