Construction/Constructor’s Number and Serial Number are NOT the same thing: c/n (whichever version you choose) refers to a manufacturer’s sequence number, assigned by them.
Serial number is usually the term used to indicate an in-service identifier for military aircraft in the same way as ‘registration letters/marks/numbers’ indicate civilian versions of same.
Serial number is also the term used to describe components of an aircraft which usually have a finite service life assigned to them.
Back on-topic I recall as a spotty pre-teen being told about ‘con numbers’ by an elder member of LAAS (remember them?), but at the time having no idea what it referred to. Nowadays in the industry we seem to use the term ‘MSN’ rather than c/n.
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