Witch Spawner on Classic

I own an island on classic that has a witch spawner on it. Anyone interested to know more or know how much it's worth? I honestly have no idea if it's valuable or not.

 

I believe its extremely valuable because I think only a few people own witch spawners or you might be the only one. Though, I'm not so sure about the exact price for it.

 

Yeah I remember it being crazy rare at the time, but I'm not sure if things have changed.

 

Blaze Spawners too, they exist.