Look at the bottom of your dial and you will see two sets of numbers. One set to the left of the "6" marker and another set of numbers to the right of the "6" marker. The number on the left of the "6" is the model number. The numbers to the right of the "6" refer to two things: (1) The movement caliber number and (2) the year of production. I cannot read your pic clearly, but I think the last two numbers to the right of the "6" look like either 76 or 79. That means the year of production is either 1976 or 1979. The numbers in front of the last two digits is the movement caliber number. Post the numbers to the right of the "6" marker and I will tell you more!
For the newer Timex watches, there is a code engraved on the case backs that tell you the year and month of production. Here is a link to a Timex chart that you should download and keep handy.
Sweet looking watch. It's a style that NEVER goes out of style. For a nearly 30 year old watch, it is as elegant looking today as any dress watch on the market. ENJOY!
Hope this helps.