Good point. The caption has to be wrong - for at least two reasons.
First, as Leftie pointed out, the white paint wasn't applied to the panels on the deckhouses until some time well after she was launched. (I'm not sure exactly when; the date may well be on the ship's website somewhere.) Second, though her hull was launched in late November, 1869, she wasn't completed until early in the following year. (She set out on her first voyage in February, 1870.)
Another hint about the date: her rig has been cut down from its original configuration. The main skysail yard and the studdingsail booms are gone.
I've seen that picture in several places - including, if I remember right, the jacket of Basil Lubbock's famous book about the ship. I think (though I'm not sure) it was taken in Australia sometime between 1883 and 1895, when she was working in the Australian wool trade. Captain Richard Woodget, who commanded her during much of that period, was a photography enthusiast; I wonder if this is one of several pictures of her that he took in Sydney harbor.
Woodget had at least two other hobbies: raising purebred collies and riding bicycles. The story is that, if the ship wasn't carrying cargo in her 'tweendeck spaces, Woodget conducted bicycle training sessions there for his apprentices. Riding a bike on an enclosed deck of a moving sailing vessel strikes me as an exercise in insanity.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.