This is yet another beautiful time piece. To be identified project. Interesting facts:
Landeron. Wilhelm. No results searching this brand. It only appeared from time to time in auctions. Was it only a jeweler, retailer or a watchmaker ?
The only Wilhelms i could came up with were all chronos and using only Landeron movements.
I don't think that there is any connection with Wilhelm Hanhart.
My first feeling was this is a LANDERON HAHN.
It is definitely from the 30's or even earlier.
I also found during my searches that all BREITLING monopushers at the time had similar movements. Here are 2 exemples:
Breitling One Button Chronograph Aus 1927 Landeron 39 | eBay
Breitling One Button Chronograph Aus 1924 Landeron 39 | eBay
Here you can fine one a bit similar described as 12" Chrono:
Breitling Uhr Chronograph One Button Staybrite Aus 1933 | eBay
It gets even more interesting when you find out even VENUS used this movement.
Vintage RARE Venus Chronograph One Pusher Telemetre Tachymetre Scales EXC | eBay
with the same Telemetre dial, the same chrono register sub hands.
Interesting fact is that Breitling only used Landeron monopusher movements. Or at least in my searches i couldn't find others. The other chrono movements were either by Venus, Valjoux, thier own, etc. but none from Landeron. Any ideas why Breitling stopped using Landeron after the monopusher ?
Anyway, any help on identifying this Landeron and of course any info on Wilhelm is highly appreciated !!
Could this movement inspire the 13" or was the other way around ? Some say this is a Landeron 39 monopusher. But i personally doubt that.
Pictures with my watch/movement (identical with the one used in Venus similar with Breitling monopushers above):