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OK I think I figure how to add this here.
I have no financial interest in this company. But have purchased from them IMO quality products.
I believe the pens are powder coated so it would need to be removed before engraving.
YMMV
for some time, the cross brand of pen was popular. i've never done one, so can't say how nice they are to work. i'd think the solid brass or copper would be good to fly with.