The model you are referring too is commonly called a ?short rail?. Short Rail?s were made from 1975-1980, and there is not a good resource to my knowledge on production numbers however they are very low in comparison to the following generation (short rails are also a pre b) regardless of the production numbers, FAR fewer actually made it to the states due to the commie block during the Cold War. They are scarce for sure and the build quality is excellent as these were manufactured much differently than they next gen once military contracts started. Swiss were the first to request the design change in the early 80?s. Here?s a pic of my 78, took me 4 years of looking to get one in my hands.
Sent from my iPhone using Tapatalk