On 11/09/2011 07:03 AM, Darren New wrote:
> On 9/10/2011 11:37, Jim Henderson wrote:
>> It seems that the physical size wasn't 'standardised',
>
> I've seen square ones designed to substitute for business cards.

I've seen square (or rather, rectangular) ones with data on them, but 
I've never seen them for sale blank.

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