Alex
Posted October 24, 2015 - 6:40am
We know this model got the name "Pater". But the first ads we have with this name is from 1925. Hence I would go for 6713 since we have an ad of that watch being gold filled.
The side engraving has these triangular flower patterns, nine in this case (count the points of the triangles) while earlier cases only had 5.
The movement is a nice 16 jewel 6P. 16 jewel movements were very common in 1924 and 1925, albeit never advertised as such. The ads keep stating 15 jewel, but reality is that the majority of the oval shaped movement from this period in the gold filled models as 16 jewel.