Hi Steve,

We have been using a kind of "stamp" marker that imprints the P/N or S/N 
onto the PCB. The result is much better if you have a solid area of copper 
(components side or solder side) where the imprint is made. Since it is 
mechanical it won't be affected by heat or solvent. The digit dials of our 
stamper had an auto-increment feature that was very useful for S/N.
The digit size was about 0.1 Inch high if I remember correctly. 10~12 digits.

I hope this helps.

Nick


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