Blimey Paul I bet you have to carry a lot of 1p pieces around if all your pens are £xx.99 
I just round mine to the pound or 50p :wink:
I put the type of pen, wood used, plating, how to look after the pen, how to operate the pen and how to replace the refill/cartridge on a 12cm X 9 cm piece of paper, which can be put in the box with the pen 
Like Paul I keep all the information on a spreadsheet, including all costs, price, who sold to and when. Duplicate sales receipts and information sheets are also backed 
