Is the unpaid IOU legally effective if it is only stamped with the official seal without the signature of the agent?

If the IOU is not forged, it has legal effect after the seal of the unit, and it does not need the signature of the agent to confirm.

If the unit believes that the IOU is forged or does not recognize the contents recorded in the IOU, it shall provide evidence to prove it. If there is no evidence to prove them, they should pay the corresponding wages according to the contents of the loan.