(1) Where a bill or acceptance is materially altered without the assent of all parties liable on the bill, the bill is avoided except as against a party who has himself made, authorised, or assented to the alteration, and subsequent indorsers. Provided that,

Where a bill has been materially altered, but the alteration is not apparent, and the bill is in the hands of a holder in due course, such holder may avail himself of the bill as if it had not been altered, and may enforce payment of it according to its original tenour.

(2) In particular the following alterations are material, namely, any alteration of the date, the sum payable, the time of payment, the place of payment, and, where a bill has been accepted generally, the addition of a place of payment without the acceptor's assent.