Tom, My way is probably over kill but I keep a log with the kit,kit cost,kit finish,material turned, the cost of material,material use for accent(if used),the cost of that material,the finish put on the pen and the type refill. Each pen is numbered and the number corresponds to the number on a card given to the customer . On the card is stamped Handcrafted by Perry Bridges. Also on the card is the type kit used, Plating of the kit, material turned,accent material,and the type refill. Each pen has a jewelry tag with the number that matches the card and the log. Like I said a bit of over kill but it helps me keep up with what I have done.
Hope this will help.