I am surprised no one has answered you on this.
All Spanish guns since ~1928 have a date code on them.
On a Llama it is usually on the left side of the frame just above the trigger guard. On that pistol it will probably be a letter followed by a number, with an * between. The codes are the same whether it's a Llama, a Star, or an Astra
To get the year for your code, google "Spanish pistol date codes"
Here's the one I use most: