Mine is not a Weathercock, but rather just an arrow, but I made it myself (I am a welder by trade) out of aluminum. I always intended to put a depiction of a sheep on t as we are full time sheep farmers, BUT that has never happened. Still I installed it 12 years ago and it works just as great now as it does then, it pivoting on a marble just as the old timers did for bearings.
I live on a hill and so I can see my weather vane from all around and since the marble bearing allows it to pivot with such ease that the slightest breath sends it around, I use it to tell which way the wind is blow, what the weather will be like, and such. But I have lived her for 43 years so I know such stuff.
Its kind of utilitarian I guess, but like an old friend. Reliable anyway.