There are two categories of Spanish Toledo jewelry. One category uses gold inlay in naturalistic motifs against a black background, very similar to Japanese damascene jewelry.
The other category displays Moorish / Islamic influences in scrolling lines and patterns, sometimes using plastic inserts that imitate mother of pearl. I believe your first bracelet is in this category.
I'm not surprised it's not marked. Most Spanish Toledo ware was sold with "Made in Spain" hanging tags. Sometimes it's marked "Spain". Once familiar with this jewelry, like anything else, it gets easier to identify.
Regarding your second bracelet: I wouldn't be concerned it's marked Mexico Sterling. That's an early mark that predates the late 1940s. I think you should test the metal, both the panels and bar links, to make sure it's all sterling. I would guess by the mark that it is, and you may even find that the silver content is higher than 925. 950 was more commonly used when it was made. This is a beautiful design - one of my favorites. I have two in my collection now. One of them made later than yours, has sterling silver panels but the bar links connecting them are a silver alloy. The other one is solid. It also has an early mark.
