Right, time to stick my head right above the parapet on this. I think most of the confusion stems from differing interpretations of common words/phrases used by this community (and others) to describe watches. I've given this some thought and offer my musings as follows.
ORIGINAL - as the watch left the factory. Nothing changed, replaced or altered.
MANUFACTURER'S ORIGINAL SPECIFICATION - a watch that has had some parts replaced. The replacement parts are OEM and to exactly the same specification as the original parts.
MANUFACTURER'S SPECIFICATION - a watch that has had some parts replaced. The replacement parts are OEM, however, they may not be exactly the same specification as the original parts due to changes in manufacturers specifications over time etc.
Whether it's popular or not, in my opinion the first time anything is replaced on a watch, be it during a service or due to wear and tear, it ceases to be original. Also, it's quite possible to have a completely original watch that does not conform to manufacturer's original specification. Think of crumbling lume, tropical dials and other indications of age (often called patina).
Then we come to the contentious areas. These are my opinions.
PASTICHE/REPLICA - a watch that contains all OEM parts, of the correct manufacturer's specification for the model, but was not assembled by the OEM and is sold as such.
HYBRID/MOD - a watch that contains all OEM parts, mostly of the correct manufacturer's specification for the model, but may have some non-manufacturer's specification parts which are clearly identified and is sold as such.
FRANKEN - a watch that contains OEM parts, however, it cannot conform to manufacturer's specification for the model,as the combination of movement, case, dial, hands etc. was never part of the OEMs production, and is not disclosed or sold as such.
FAKE - Non OEM parts designed to deceive.
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