1. we can only decipher the year of production by seeing the serial number on the movement.
2. it's not purely a "wind-up" mechanism. it's an automatic winding movement. all eternas marked "eternamatic" from this era had full rotor automatic winding. if it had been been marked "eterna automatic" then it would have been a bumper auto. if marked merely eterna, then probably a hand-wind only. later on, say, after the late 70s, the dial printing became more fluid as to these distinctions. (edit- statement #2 relies on the correct dial markings. some refinished dials are incorrectly re-painted thus not emblematic of this notion.)
3. the only way to tell the content of the case is to look for an external hallmark, or to open it and read the caseback.
4. if the bracelet is not marked eterna, then yes, it's probably after-market.
5. in my opinion, the dial has been refinished.
6. it is a nice watch. eternas are my favorite vintage brand.
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