My mum accidentally wrote a £1000 cheque – with her signature – in a chequebook I didn’t even realise I had (and subsequently lost). It went through. Bank said they don’t check sigs below £10k. Don’t talk to me about security 

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And old payment instrument looking for a new identity in the wrong field (paper and printing security characteristics).
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plus burying a specific spelling mistake in micro text also provided security validation (on top of security provided by the chemical and water fugitive inks)
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