Dark olive green. (It may look a little faded in the pics, but it's not. It had gathered a little dust, which I didn't dust off before taking them.)
Size 60, which is large, about 7 1/2 in US.
In answer to a couple of questions I've been asked:
I bought the hat new in Venice.
I don't know the model.
The brim is 2 1/2 inches wide.