I found this site which lists the production/proof date codes for Spanish pistols. I was able to date my Star Modelo Super A as a 1953 model.
This will apply to Star, Astra, Llama, etc. pistols.
The code should be found on the left side of the frame just above the trigger or under the frame and it will be identified by a * over the letter or a * over the letter and number year code. http://9mmlargo.com/year_codes.htm