How do you write a letter to change a bank account signature?

The Manager

Name of Bank

Address

Date

Subject: Change of Signature for My A/C No.

Dear Sir

This is to inform you that I have changed my signature for the opeation of my subject account.

With effect from the date of this letter, all transactions pertaining to my above account are to be honoured only if signed with my signature appearing on this letter. Such signature is to be treated as my specimen signature for your record.

Should you require my signature on your printed form/specimen card, I shall gladly comply upon receipt of your such document.

Meanwhile, kindly acknowledge receipt and confirm the above arrangement.

Thank you.

Yours faithfully,