I recently was able to purchase a nice watch collection from a very well known collector and watchmaker in Tennessee.  He kept very good care of this watch and put up a fight when we were discussing me purchasing it to sell here.  Below is some information about this watch:
Brand: Rado 
Model: Diastar "Original" magic 17 jewel automatic
Era: Late 1970s early 1980s
Running Condition: This watch has been serviced and is running good and keeping good time 
Case Composition: Gold Plated
Size ( including lugs, but not including crown in measurements ): 42.5mm by 35mm 
Wrist Size: This watch and band combination can work for wrists up to 7 1/2 inches in circumference.  This , of course, can easily be changed by changing out the watch band.
Band Composition: Stainless Steel Two tone
Condition/Notes:  C.M. VI. Made in Italy original watch band bracelet.  This model is considered the "Original" Here is some info I found pertaining to it:  
Email confirmation from: Rado Watch Co. Ltd Switzerland:


“This watch is called Rado DiaStar Original

This watch was produced between 1976-1981 with a total of approximately 6’000 watches.

  This watch is the Rado watch model that almost all newer rado watches are imitating.  I have put the buy it now price very reasonable, so please consider it carefully.

Thanks for looking. Please take a look at all the other clocks and watches I have this week and weeks to come as well as my store inventory. I am telling you this, because I will gladly combine / reduce shipping whenever possible. No international bidders without prior approval. Please feel free to ask questions or request additional pictures. All watches and clocks are tested at time of listing and rechecked when shipping. The post office can be unkind to vintage timepieces during shipment. Because of this I package items better than necessary to insure a positive experience. Condition of clocks and watches are all documented with photos and video prior to shipment. No International bidders without prior approval. No Customs fees are included in the shipping quotes I give. Also I cannot be liable for delays at customs checkpoints. No Shipments to Italy ( sorry ) Thanks for looking and have a great day.