Now, firstly I have no idea if this is the correct size or whether the details are screen-accuarate. It's just something I made and printed out for my PR and it seems to work well.
Hope it's useful.

Right click> Save Picture As...
• Image is approx 70mm x 22mm when printed at 300dpi
• Type your desired six-figure serial number (with double spaces in between each digit).
• The font I used was Swiss 721 BT (bold). 'Arial' bold will make a
reasonable substitute if you don't have it.
• Best printed on Photo Paper or thick(ish) card.

:8)
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