A blast from the past...
I got this vintage Eterna watch from a fleamarket.
Nice finish on the inner side of the caseback:
The watch has one major drawback, though. It is highly radioactive due to its self-luminous paint which contains radium (Ra226, half-life: 1622 years). Radioactivity out of watches? Yes, indeed - and it is dangerous, too. I recommend reading the sad story of the so-called Radium Girls. Therefore, I decided to NOT repair this watch and keep it in a safe place.