OPI's Espana collection was the first nail polish or makeup collection that I bought multiple items from, and fully understood that it was from a collection versus just individual products.
Pamplona Purple is a warm, midtoned purple that in certain lights can look very purple and certain lights can look very berry. It's a creme finish and was very easy to work with. I have 3 coats on my nails over Nubar's Foundation Base Coat and under Seche Vite.
I haven't reached for this polish in a while... I maybe wore it last like... a year and a half ago, but it's always something I mentally reference to when I think about wearing purple polishes. I was pretty in love with it when I first purchased it because it is one of my colors, was very on trend when it was released, and it was a perfect shade of purple for me. It's not too warm and not too cool and isn't too light or dark. It's pretty versatile for a number of different skintones as well.
I was very happy to pull this out again and find that the polish hasn't gotten thick or anything and was still as easy to apply as previously.
I think you can still find this, and if you can it'd be about $8 or $9. OPI can be found at salons, Ulta and various beauty suppliers and etailers.