Just before I ebay it, I'd like to show you this little watch from - I guess - the 1920's. The movement has the Swiss patent number 167231 and a really cute monoplane on the winding wheel. The balance staff is broken.
The face is remarkably clean, with 24 hour markings alongside the usual 12.
I'm kinda hoping Hartmut will recognise it as an early Vacheron Constantin brand.