For G, I looked to Guilloché patterns (https://en.wikipedia.org/wiki/Guilloch%C3%A9), traditionally engraved using a rose engine lathe. Classically hard to copy, these lines often give money and certificates a feeling of officialness.

Plotted using fountain pens
- a Pilot Metropolitan Fine wit ku-jaku iroshizuku ink for the background
- aTWSBI Eco Extra Fine usingFerris Wheel Press Glistening Glass for the letter (for a little sparkly anti-forgery vibe)

https://www.instagram.com/p/CrJiv6Fv7jw/

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