Hi Zaf,
Firstly I am sorry but I got the caliber wrong. It is a cal 901 auto so that may help. I also think it might be 80's. I have now got a pic of the movement. It is in an 18k case which is quite thin.
Regards,
Greg.

Hi Zaf, I have a JLC cal 900 automatic. I would like to know how many jewels this movement had and the time frame of manufacture of this particular calibre please if anyone has this info. Also I don't know if there is a problem with the movement as when the crown is fully pushed in it moves the date...