So, I'm giving away my Hoya 58mm circular polarizing filter. I bought it for like $50 a couple years ago and only used it once. I think if I had gotten into landscape photography, I would have used it a bit more. But I didn't. Polarizers are useful for making your skies bluer and cutting your reflections in windows and the water.
Without a polarizer, you cannot read the words (which are highly reflective).
With the polarizer, the reflection is cut, and you can read the inscription.