A Bank Guarantee will be drafted within strict and standard confines. When issued by SWIFT, the Bank Guarantee will contain fixed fields, each field is numbered and contains a specific item of data, such as date, expiry date, amount, etc.
When the Bank issues a Bank Guarantee, it will generally send it also in original form to the Beneficiary Bank by post of courier. It will take the form of a letter.
It will not look like a colourful certificate and will not contain fancy wax seals ! It will more than often look like a modest document printed on standard bank notepaper and signed off by an authorised officer of the bank.