Spain mint marks [solved]

Hello!

Comparing this coin with this one, I've noticed that one has the year in the stars while the other doesn't, and they're basically the same coin.
Is there some general rule that can help tell which coins are supposed to have the dates stamped and which aren't?

Below are the mint marks magnified from Numista images.




I would appreciate any additional info relating to these. Thanks!

Hello.

Essentially you have found the origin of the spanish dates in the star. The coin that From 1868 and until 1982 in almost spanish coins the main date there are the date of emission of the type of the coin (when the law of approvement of issue was published) and the internal date in the star, the real issue date.

You can find coins with one star and one number https://en.numista.com/catalogue/pieces13984.html, one star with two numbers https://en.numista.com/catalogue/pieces946.html, two stars with one number https://en.numista.com/catalogue/pieces14677.html or two stars with two numbers https://en.numista.com/catalogue/pieces8570.html

Also, from this date, 1868, all the stars has six points (belonging to Madrid mint). Before this, you can find the star as mint mark, with different number of points (six points, Madrid; five points, manila; four points, Jubia; seven points, Sevilla, and eight points, Barcelona)

Ah! Turns out the answer is a lot simpler than I thought it would be. Thank you for your detailed reply!