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craftsmanship
The noun 'craftsmanship' is a singular, uncountable noun; a word for a quality. Either something has 'craftsmanship' or it does not.
The noun 'craftsmanship' means the work has the quality of a master of crafts.
By the quality of the craftsmanship. By the quality of the craftsmanship.
There is not verb form for the noun 'craftsmanship'. A related verb is to craft.
Do.