Issue numbers are typically located on the front of the card, and normally it is indicated as ‘01′ unless you have had your card replaced at any time.
But on a Barclays debit card, it is not embossed. For details, contact Barclays on 0800 282 390 (in the UK) ; +44 (0)207 116 7488 (outside the UK) or 0333 200 2196 (from a mobile).
If you check the card face of the Barclays debit card, what you see is just the 16-digit number which represents the card issuer and your specific account number. On the back side of the card is the CVV2 number, or security code number. The last three digit number on the signature strip is used by merchants as a way to verify that the cardholder is present at the purchase.
According to sources, Visa's tend not to have an issue number; they're typically reserved for Switch Maestro and Visa Electron.
If you need to ask something, you can tweet your enquiry to Barclays UK Help on Twitter - @BarclaysUKHelp.
For more helpful information about your Barclays debit card, see Barclays.co.uk's debit card section.