以下是一份典型的银行PB（Performance Bond）履约保函的英语样本，供参考。
Bank Letterhead
Date: [Date]
[Beneficiary Name]
[Beneficiary Address]
Subject: Performance Bond for [Project/Contract Name]
Dear Sir/Madam,
We, [Bank Name], hereby issue this Performance Bond (hereinafter referred to as "the Guarantee") in accordance with the terms and conditions stated herein.
The undersigned, [Bank Name], a financial institution duly organized and existing under the laws of [Country], having its registered office at [Bank Address], hereby undertakes to unconditionally guarantee and undertake to pay without delay to [Beneficiary Name], up to the aggregate sum of [Bond Amount in Words] ([Bond Amount]) upon first written demand by the Beneficiary pursuant to the terms of the Contract Agreement dated [Contract Date] entered into between [Contracting Parties].
This Guarantee is valid until [Expiry Date], provided that any demand made hereunder is received by us on or before [Expiry Date] and accompanied by written statement that the Principal has failed to fulfill its obligations under the Contract Agreement. In case no demand is received by us on or before [Expiry Date], this Guarantee shall automatically expire and be null and void without any costs or liabilities attaching thereto.
In consideration for the issuance of this Guarantee, the Principal irrevocably and unconditionally undertakes to indemnify us promptly upon our payment under this Guarantee. The indemnity shall cover all payments made by us under this Guarantee, including, but not limited to, any expenses, costs, fees or charges incurred by us in relation thereto.
This Guarantee is governed by and construed in accordance with the laws of [Country]. Any disputes arising out of or in connection with this Guarantee shall be subject to the exclusive jurisdiction of the courts of [Country].
Please acknowledge receipt of this Guarantee by signing and returning a copy of this letter to us.
Sincerely,
[Authorized Bank Representative]
[Bank Name]
[Bank Address]
[Contact Information]
[End of Guarantee]
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