Checked GW2DB.com – of the total list, it only seems like there’s a partial list of “craftable” superior sigils and runes.
Just looking for a definitive answer here from ANet.
No. The vast majority of Superior Runes/Sigils are not craftable. Some come from Dungeon vendors and are account bound, so they can’t be traded. Others only come from drops or special armor/weapons. For instance, any runes relating to a home city’s name (e.g. the Citadel, the Grove, Rata Sum) cannot be crafted.
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