Every Person who, except in administering such Declaration, acts as a Guardian, being incapacitated or not duly qualified to act, or before he has made and subscribed such Declaration or after having become disqualified, shall F1be liable on summary conviction to a fine not exceeding the statutory maximum and on conviction on indictment to a fine: Provided always, that all Acts as a Guardian of any Person incapacitated, or not duly qualified, or not having made or subscribed such Declaration, previously to the F1conviction, shall be as valid as if such Person had been duly qualified and had made and subscribed such Declaration.