Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.
There are over forty such techniques, each using a different radioactive element or a different way of measuring them.
Write this number down and compare it to the charts on this website.
This will give a good idea of the manufacture date.
Because of their interrelated nature, a change in one institution will affect other institutions.
Various theoretical schools emphasize different aspects of change.
Many are also unaware that Bible-believing Christians are among those actively involved in radiometric dating.
This is probably the most common question watch collectors have.
Sometimes it is easy to answer, and sometimes it is impossible.
Some companies (as with the Gruen Watch Company), even lost rocords to fire or other natural disaster. I am sure they had no idea that their timepieces would someday be collected.
There are several ways to get an idea of when your watch was made.
He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.