I picked this up towards the end of last year - a little Eterna desk chronometer from the 1980s in a wood, brass and leather case about three inches square. Since it wasn't working and I couldn't get to a jewellers it went in the back of a drawer and I forgot about it until a few months ago, when I rediscovered it and had the battery replaced. I know it dates to the 1980s because I have a copy of the original Watches of Switzerland sales receipt which has a date of 1989, and if you wanted to buy one back then it would have set you back £111. I don't know much more than that - I'd like to find out more, but I'm stumped because I have yet to even see another. Does anyone here have any thoughts on it?