A friend of mine recently visited the North Head Artillery School site (I think) and while taking a few photos, found this piece and passed the photos along to me. I think the scheme is probably a repaint, and I have no idea why the gun barrel is bare, but here's the photos anyway. Enjoy!
Many, many thanks for this post. These are the best pics I've seen of this gun! I want to post them on the site as well. Hope that is OK with your friend.