Comptometer - can any-one help me with a power lead?

From: Ali
Email: averlander@deloitte.co.uk

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I have a comptometer 993m from the Bell Punch Co with the following information on the back ; 12/1VB/LD702394 The distributor was Sumlock Compometers Ltd London SW1. I would love to get ths going but have no power lead… can anyone help? or give me any idea of where I can start looking for one? Thanks