I don't know about "Number 1," The official Spanish name for their top grade saffron......
The Spanish standards for saffron use both names and numbers, Boar, with the numbers corresponding to those of the ISO. I rarely use Spanish saffron, so never learned the names.
Here is how La Tienda describes the one-ounce tin on its website, for instance:
"One Ounce Tin of Saffron by Princesa de Minaya, D.O. La Mancha
The Best Saffron in the World
Intense flavor and aroma!
D.O. La Mancha is the best available!
Category I; DO La Mancha (emphasis mine).
Size - 1 Oz - 28 Grams"
That would be the Spanish category 1. But things being equal to equal things, it's no different than the ISO standards.
For what it's worth, Italy uses its own scale, which does not correspond to the ISO's. So unless you're familiar with Italian grading (and, given the paucity of production, how many of us are?), you can't corrolate Italian saffron to either Spanish or Persian.
I use substantially more saffron than that, Margcata.
Me too. I go with a healthy pinch.
.....use powdered saffron instead of threads.
I have a problem using powdered. First off, like you, I learned with tendrils and that's what I'm happy with. But, beyond that, I have a built-in bias against pre-powdered spices of any kind.
That may or may not be objectively correct, but there it is. I also wonder how much adulteration has taken place with the powdered? Again, I have no factual evidience that the powdered is any less pure. But it would be too easy to adulterate it.
Ironically, I often grind the tendrils and then bloom the powder before adding it to a dish. Go figure!