Have you ever heard the term 'Tostado' used to describe a red horse with flaxen points? It seemed to be in use for a short time then faded away, I guess?

Yes, I was just reading my Horse Color Expalined book and they do use the word tostado to describe what you have

"Tostado" is a commonly used skin color in Spanish-speaking horse cultures. In Argentina, where I worked for many years, I rode a Criollo mare named "Tostada" (the "a" is the feminine version of the word). Translated, it means "toasted", as in a toasted piece of bread. That's exactly what she looked like; burnt toast. And that's what I called her when she didn't perform. -- RTB

In Spain, an "alazan tostado/a" would be a darker sorrel with some shading maybe that has darker points, not ligher ones as someone else mentioned, thus adding the name "toasted" to that color.

Here is an old list of horses brought by the first spaniards to the new continent:

http://www.peruvian-pasos.com/history_mccormick.html


A list of horses brought to the new world as chronicled by Diaz.

Owner Color Owner Color
Cortez Castano Zayno (Zaino) Montya Alazan tostado
Alvarado Alazana Moron Hovers labrado de las manos
Puertocarrero Rruzia Baena Hovero algo solremozillo
Leon Rruzia Sares Castano algo claro
Olid Castano escuro Grtiz Ascuro
Sedinno Castana
Bernal Diaz de Castillo,
Historia verdadera,
Mexico 1904