The hat is 1 of 1 forever, this hat has existed since 2014 so it's safe to say this hat is the only one in its existence, the hat itself over the past 4 years specifically has had a very low trade history, only 3 being made in a span of about a month this year. Other demoman hats with the same exact effect are going for much higher prices despite the proof of more than 1 existing. I would say an extra increase from 80 keys to 100 would be fair since almost all demoman hats with this effect are going for usually around 100 keys or more. To say 80 is an accurate price for this particular hat and this particular effect seem inaccurate.