Hi,
Hard to say exactly. It is not 80's, it is mid 1950's from all the clues I can see (label, style, etc). My research indicates that Doeskin felt makes its first appearance in the late (?)1940's, as a less expensive wool alternative the more pricey fur-felt. Of course it may have been around earlier but I find no reference to it so far. So far that is!
The heart may or may not be original......but the feathers do look added at a later point (and look a bit cheesy/cheap to me). The ornament looks odd dead center like that, most professional milliners would put it off center or to the side. Which leads me to think they were both added later. Just sayin'.
As far as dating it by comparison to a hat on Etsy or Ebay...my advice is....and I cannot stress this enough ..DON'T. This brings up an interesting point that I may put on another thread. The hat that someone linked to is not 1940's, although the seller claims it is, and has also been altered with an addition of inexpensive feathers and he/she got the designer wrong. So if you see a hat that claims 30's or 40's, etc....and it is not dated correctly, then you would be using an inaccurate reference for dating your own hat. At least 75% of the hats on Ebay and Etsy are dated incorrectly. Yup...75% and maybe higher. My advice is to do your own research, unless of course you trust the seller to know what they are talking about. And even then....it can be tricky.
Barbara