I have my grandfather's LeCoultre watch and my father's Jaeger-LeCoultre watch. The LeCoultre states 10K gold filled on the back and the Jaeger-LeCoultre states Memovox and 988096. Please advise as to age and value. Also, how does one change the date on the Jaeger-LeCoultre? Thank you.
To the left a US market "Wrist Alarm", probably late 1950s, the second a JLC "Memovox" date (this does not quick set you have to turn the hands to set it) dates from the early 1960s.