For a while I bought an inconspicuous typical art deco pocket watch with metal dial out of the 30 ties I guess. The case is gold laminated one made by generva watch case (MGBM).
I always thought a Grana or Certina out of this aera would own a Kurth Freres movement inside. Recently a certina colletor told me that this could be but does not have to be. I get curious and this watch needs service therefore le'ts do it. I didn't found any maker marks on the movement parts or a correct discribtion of the movement with the number 972368. The quality is a bid wobbly for my taste but it is good standart swiss quality out of this aera. I hope someone can help me to find out the caliber or maker:
15 jewels ligne droite, screw balance without shock protection and a blue flat spiral.