Anyone care to take a stab at dating this one? ... And confirm it's a Valjoux VZ or 23 caliber? It measures about 12 ligne as far as I can tell. From the photos on the web I've compared to it seems that maybe it's an early version of this caliber.
It's very new to me, was an estate sale find. Runs but has stopped one me twice in the past 3 days. Could just need a cleaning but I'd like to find a competent trustworthy tech to take a look at it.