I'd like to carefully touch up the gold writing ("Alembic") that's worn off one of my pickups.  Any ideas?  Thanks!

Eric.

There are pens with metallic 'ink'... not sure how they would work in practice, but I bet somebody else here has tried this.

The decoration is with a hot stamp and gold foil. I'm not sure you can make a suitable restoration other than just sanding off the face entirely and going blank.

Ahoy,

I found a way with Google, but I don't know how fun this will be.  Like Mica has said, it is basically the applique (accent aigu) of thin gold foil onto a prepared, raised surface that has a gold embedded adhesive on it (a "raised guilding" technique, I think they called it).  Maybe put a thin layer of the adhesive on a flat metal surface, cover the letters with aqueous primer, repeat, and then apply the gold foil really carefully? 

But, what the heck do I know, though?  I can't even frost a cake.

Good luck, and I hope if nothin' else, these links might give you a place to look next for a workable answer-

Raised letters: https://www.calligraphy-skills.com/gold-leaf-technique.html
Gold leaf and gold leaf paint techniques: http://homeguides.sfgate.com/apply-gold-leaf-embossed-surfaces-89758.html

Cheers,
-Zut