(70 ILCS 210/21)
(from Ch. 85, par. 1241)
In case any officer whose signature appears upon any check or
draft, issued pursuant to this Act, ceases (after attaching his signature)
to hold his office before the delivery thereof to the payee, his signature
nevertheless shall be valid and sufficient for all purposes with the same
effect as if he had remained in office until delivery thereof.
(Source: Laws 1955, p. 1125.)